Mike and Sally finally get married and leave for the East where Mike has a job as an assistant college psychology instructor. Robbie happily moves into Mike's old room. When Uncle Charley notes that they may soon be calling Steve 'Grandpa' he becomes somwehat concerned about growing old and calls up his former girlfriends. Robbie, now a college man, offers to help his father make friends with younger women, and while pretending to be disinterested, tries a few of his suggestions. When it is learned that Ernie must return to an orphanage, because he will not be allowed to accompany his foster parents in their move to the orient, Chip invites Ernie to move in permanently, giving Steve three sons once more.

Steve explores the possibility of adopting 10-year-old Ernie but runs into antagonism from Uncle Charley, who can forsee nothing but more work with a new boy to take care of. The family desperately wants to adopt the boy and Robbie decides that Steve must make a play for the lovely Miss Coulter. Her boss comes to inspect the house just as the boys have made a shambles of the place. At eight the next morning, Miss Miller returns. She inspects the house, spic and span now, and ushers in a happy Ernie, who is to stay on a temporary basis.

Ernie's adoption into the all-male Douglas household is threatened by a regulation that there must be a lady of the house. Steve again makes a request to adopt the child, but Misses Coulter and Miller of the adoption agency, say they are powerless to change the regulations. Miss Miller has a brilliant idea, however, and soon the family is appearing before a judge who decides that housekeeper Uncle Charley can legally be designated the 'lady of the house'. Charley approves if this fact is kept secret and Ernie is enthusiastically welcomed into the family.

Uncle Charley is upset when he learns that Robbie is dating a flashy chorus girl, but Steve refuses to worry because he trusts his son's common sense. Charley predicts Steve will be invited to pay the girl cash on the line if he wants her to stop dating his son.

An escaped circus lion makes a midnight call at the Douglas house, and Ernie sees it and awakens the understandably skeptical Steve who accompanies his new stepson to investigate. Steve eventually sees the lion and nervously plays a game of tag with it, warning the family to keep their bedroom doors closed.

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Chip's secret love is an older girl named Mary Lou. When Steve suggests his love sick son should find out where he stands by asking for a date, Chip calls and identifies himself as 'Douglas'. Mary Lou is delighted -- thinking she is going out with Robbie Douglas, a genuine college freshman.

Ernie writes a play and volunteers Steve's services for his father-and-son night, so he dons a heavy robot costume. The family leaves early, and Steve finds himself alone on the street, helpless in his non-removable suit.

A seductive dance instructor named Helen signs Uncle Charley up for a lifetime membership in a dance club. Dreaming of a professional dancer's career, he purchases a top hat and tails for his appearance at the school's annual ball.

Robbie is so eager to make the track team that, to improve his timing, he agrees to join a ballet class. He proves an unwilling pupil, self-conscious in dancer's tights and ballet shoes, but after days of practising, his hurdling style suddenly improves. Reluctantly, he agrees to become the sole male dancer in the upcoming Ballet Class recital.

Ernie feels neglected when the other members of the Douglas family are busy with various girlfriends and he is left alone. Close to tears, Ernie is puzzled and saddened by the mysterious powers of the opposite sex. He's even more puzzled when he meets eleven year old Linda-Lou.

Steve Douglas turns a business trip to Hong Kong into a vacation for the whole family. Uncle Charley, who once lived in China, is reluctant to visit modern Hong Kong, for apparently he still carries a torch for a beautiful girl he knew in the 1930s.

Steve's unusual behaviour convinces his family that he is about to be secretly married. The boys plan to leave home to provide privacy for the newlyweds, and Charley arranges to ship out on a freighter. Steve brings the pretty blonde girl home to meet the family, only to find the house deserted.

The Douglas family bravely accepts the challenge when 13 year old Chip decides to give a party -- with girls. On the party evening the record player breaks down and Chip contemplates the disintegration of his first teenage party. But Steve comes up with a solution.

When Steve travels to Washington on business, he leaves $50 with Robbie, to pay for golf club repairs but Uncle Charley limbers up his billiard cue to get revenge after two girl pool sharks take Robbie's $50 when they coyly ask him to show them how to play the game.

A huge shaggy stray dog adopts Steve Douglas and disrupts the neighborhood with his howls when Steve tries to leave home. A neighbor and lover of stray animals, is delighted to learn that Steve plans to keep the dog until its owner can be found, rather than sending it to a shelter. However, the dog continues to regard Steve as his mother as well as his master.

Steve Douglas meets recently divorced Maggie Bellini, reputed to be one of the world's ten richest women. She sets her sights on Steve by showering his family with costly gifts. Robbie has the use of an experimental sports car, Chip is invited to fly to Austria for a weekend of skiing, and Ernie is provided with the use of a computer for his arithmetic homework.

When Robbie Douglas yanks pretty co-ed Terri Wong out of the path of a speeding truck, he becomes the unwilling beneficiary of an old Chinese custom when the girl whose life he saves insists on being his slave. The game is amusing at first but before long Robbie must ask his father for help.

Steve Douglas is attracted to a beautiful female explorer who shows Steve and the family her exciting adventure films. She has to prepare for a safari, and as there is room in the party for one more, she begs Steve to come along.

Robbie takes on a heavy work load of waiting on tables in his girlfriend's sorority house and working as a chemistry laboratory worker, so that he can rent a room away from home. Worst of all, his romance with his current girlfriend languishes because he is too tired to take her on a date.

When Chip adopts a Beatle-style, shoulder length haircut, the other members of the family feel that Steve should lay down the law to the long-haired one, but he and his associate consult a company psychologist for a solution. Steve decides not to be a strict father but to give the boy more attention, without affect.

Robbie Douglas is practically engaged to his girlfriend Joanne, and when they discover how their friends are both successfully attending university while raising a baby they begin to think that perhaps teen-aged marriages are workable.

Two tomboys - a pretty lady engineer named Max and a member of the girls Hockey team named Georgie prove tough to handle for both Steve and Chip. Hoping to become a hero to his peers, Chip goes out for the girls hockey team when Georgie insists the coach must let her join the boy's track team.

Robbie Douglas learns how much of a pest a younger sibling can be when Chip and a buddy break up his date with a pretty girl by eating appetizers and otherwise making a nuisance of themselves. The next afternoon, for revenge, Robbie primes his other brother Ernie to haunt Chip and his date.

Robbie has a wonderful time going steady with two girls simultaneously -- a highschooler and a college co-ed -- until the two ladies compare notes one day and plot immediate revenge. They maneuver Robbie into dating the both of them on the same night.

Ernie Douglas sends a letter to the French Embassy to thank France for the Statue of Liberty and receives, in return, an invitation for him and the rest of the family to visit Washington, the nation's capital. However the other members of the family are not too happy with the idea.

Chip is worried when his younger brother Ernie becomes a close friend of a pretty sixth grader, because the girl is now interested in collecting postage stamps, and Chip is sure she has her eye on Ernie's precious Liberian triangle.

Chip demands a jury trial after he borrows four cents from a pile of brother Ernie's pennies and Ernie accuses him of taking a valuable penny from his coin collection. Finally Chip accepts Ernie's challenge to stand trial in a court composed of their friends.

Ernie packs a suitcase, ready to leave home, after he fails to win a cup for the family trophy shelf. He eagerly goes into training, planning to win a school track award, convinced that he won't really be a member of the family until he too can provide a trophy.

A boy who looks just like Robbie almost ruins his reputation by driving around on-campus and inviting strange girls to kiss him, before the deception is uncovered. Finally, both boys and their parents are brought to the dean's office.

Uncle Charley takes away Robbie's driving privileges after the campus beauty queen gets a $16 traffic ticket while driving his car. Robbie then faces the horror and humiliation of exisiting without a car, but soon to his amazement his girlfriend is enjoying walking home from school with him.

The Douglas family returns from a trip to Britain and as the family watches home movies of their vacation, the amateurish footage reveals the reason for Steve's current moodiness: He is still carrying a torch for a lovely widow.

The usually all-male Douglas household becomes a refuge for an attractive girl dancer who has been evicted from her apartment, when Steve attends an office stag dinner. He takes her home where he lends her some of Robbie's clothes.

Steve Douglas takes his family to his birthplace of Bedford Springs. He tries to locate his 1940 fiancee Ellen, married and still living in town, but he is disenchanted by the changes in her. Still pretty, she lives with her obnoxious husband and ill-mannered children.

Steve Douglas receives a perfumed letter from an old girlfriend announcing she will stop by and see him. She terrifies Steve by acting as though she plans to accept a proposal of marriage he hasn't made. Steve does his best to convince her that his old college chum is the man for her.

Three fathers face their sons in a quiz game at a school entertainment night, and when the boys easily beat the dads so much interest is aroused in town that a re-match is scheduled on the local television station.

Because Robbie's friend wants him to understand Italians better, he invites Robbie to his home. Robbie runs afoul of an old custom when he takes a girl walking in the park and learns that he is expected to marry her.

Steve Douglas gets a parking ticket from Robbie's girlfriend, a pretty meter maid, and another citation for not having his driver's license renewed -- and then flunks his driving test. Soon Robbie realizes that he's given his father last year's manual to study and that some laws have been changed.

Robbie films a 'way out' movie for his Cinema class with the aid of a non-talented, 'way out' co-ed who earnestly tries to make an 'honest' motion picture. They begin a long week of filming uncinematic gems spotlighting the Douglases dull, drab meaningless family routine.

Ernie feels left out when the Douglas family orchestra begins to practise. Uncle Charley tries to teach Ernie the violin but runs into a major obstacle -- the boy's lack of obvious talent.

When Robbie's girlfriend's father calls from out of town and asks him to deliver a birthday cake to her, he thinks there might be a fortune in performing this birthday service and immediately goes into the cake business.

Robbie is immediately infatuated when he hires a pretty chemistry instructor as a tutor, and their friendship seems to be blossoming. But when he finds out that his father has been dating her, the shock affects his ability to concentrate on his studies.

When Ernie sends for a picture of Chip's favourite movie star, planning to give it to him as a birthday gift, Chip gets an actual date with the movie starlet for a publicity stunt and is astounded by all the resulting hoopla.

Steve Douglas meets a celebrated popular vocalist of 20 years ago whose career seems over. Although her famous voice is still there, the public demands music in the current style. Steve helps her update her style when he arranges for her to sing with Robbie's combo, the Greefs.

Ernie sneezes as he brushes past the family dog, Tramp, and when a doctor verifies the boy's allergy to dog hair and says the dog must go, Ernie packs his bags as he feels Tramp has seniority over him in the family.

Chip's romance with a classmate flourishes when he rents a horse and buggy so as to impress the girl's strict, old fashioned grandmother. She is impressed, but still insists that the kids stay at home to have a taffy-pulling marathon.

Ernie's excited reports of seeing a flying saucer are received with skepticism, but the next day he not only sees the weird vehicle again, but he snaps some pictures and is later told by the Air Force to keep quiet about it.

Robbie is delighted when college classmate Peggy moves in next door, and the pair immediately go to work on a joint assignment for their Shakespeare class. He plays Romeo to her Juliet when a feud between the two families seems imminent.

Steve Douglas passes up his company's offer of a weekend in Rio because Saturday is the start of trout season. The boys do their best to get Steve to make Ernie his fishing buddy so Robbie and Chip can get out of the annual trip.

Television viewing at the Douglas household has dropped to zero because Uncle Charley, annoyed with the boys' quarreling about choice of channels, has withdrawn all TV privileges for a week. Robbie, a member of a new program committee, eagerly joins his co-ed girlfriend in her plan to bring true drama to the people. However, after viewing the show, the family isn't sure their attempt at 'realism' is really real.

Ernie's friends all boast of their dads' college athletic trophies, which forces Steve into a grueling two mile cross-country race with the other fathers. Two of the men, once athletes are eager for the contest, but Steve thinks it is silly.

Uncle Charley puts down a deposit on a vacation lot at beautiful Whispering Pines, only to learn he's been hoodwinked in a high pressure real-estate operation. The family discover that it is located at the bottom of a steep canyon. It is next to a tumbledown shack, occupied by a slovenly family who prove themselves completely undesirable as prospective neighbours.

Robbie Douglas tries to impress his girlfriend by competing with a handsome bullfighter against a killer bull, but has to flee for his life when the bull charges him.

Robbie is crushed when he learns that Denise DuBois, a French exchange student that Robbie had hoped to marry, has accepted his friend Tom's proposal of marriage the night before.

Chip Douglas's junior high school is having an Olden Days dance and the boys are to bring their mothers, and the girls their fathers. Chip finds trouble going steady with two girls at the same time and arranges for Steve to escort his classmate's widowed mother.

To help out his Dad, Steve, Chip pretends to like the aggressive as she is pretty, daughter of a new executive woman that his dad is dating. Chip has the romantic notion that his close relationship with the daughter might help the social plans of his father.

Uncle Charley's romantic tales of adventure captivates Ernie's teacher. The pretty, middle-aged lady is fascinated by the old boy's partially-true tales of his exciting life on the high seas. Soon the ex-seacook is aghast to learn she has given up her teaching job and he is further torn when she explains her savings will buy them both a one-way ticket to Pango-Pango and asks him to marry her before they leave.

Ernie Douglas's new school friend is little Laszlo, whose gypsy family is camped outside of town. Soon the gypsies are camped on the front lawn of the Douglas home. To Steve's amazement and Uncle Charley's disgust they stage several hours of singing and dancing.

Other fathers help their sons in a school science fair, but Steve tells Ernie he's on his own. Soon his project turns to disaster when his very crudely built electric clock absolutely refuses to run. After vainly pleading that most of his classmates are getting parental help, on the day of the fair, Ernie must be forced to go to school.

The older members of the Douglas family find their social lives complicated when little Ernie decides to accompany them on all of their dates. Uncle Charley decides he must be the one to put his foot down and set the boy straight.

A genial bum Ernie brings home for dinner outrages Uncle Charley by eating everything in sight and then decides to stay the night even though he wasn't invited. Steve feels that they should let Ernie work things out for himself.

Robbie leaves school after contemplating a very important offer from a former school drop out who now heads his own Real Estate company. When giving some new home buyers a tour of one of the company's display homes, he discovers that the houses are not what they seem.

Uncle Charley's old seafaring buddy arrives with a wonderful proposition: He wants Charley to join him as first mate for a six month fishing cruise in the Carribean. The family then conspires to demonstrate to Charley that he is not needed, but they really don't want him to leave.

On a visit to Hawaii, Robbie falls in love, Ernie almost gets arrested and Uncle Charley is pursued by an old girl friend from 1945, who weighs 200 pounds now. Charley thus finds it necessary to stay in hiding until the plane leaves for home.

The Douglases move to California, where at first they are depressed to find the residents as chilly as the weather is warm. Robbie enrols in the University and is totally captivated by a blonde girl, and Uncle Charley is initiated into the rapid-fire procedure of shopping in supermarkets. The family begins to feel that their next door neighbors represent the characteristic stand-offishness of all Californians until they discover that they moved into the neighborhood the day before they did.

After advice from his father who tells him it isn't right to tie himself down to one girl, Robbie Douglas, intending to break off his romance with Katie Miller, ends up proposing to her. Soon his heart over rules his head and he buys an engagement ring and sets a wedding date.

Robbie and Katie pick a wedding date two weeks off. Katie's sorority sisters decide to do some private investigating on their own. Prospective groom Robbie then undergoes the complete once-over by his fiancee's family and runs the gamut of numerous cousins, aunts and a crotchety grandmother.

The day before her wedding Katie Miller feels she faces complete disaster. When Robbie tries to console her, she flares up at him and after a short argument, the pair declare the wedding is off. Of course, Grandma Collins thinks otherwise.

Early on his wedding day, Robbie Douglas and his family are peacefully oversleeping. They awaken just in time and scramble madly to get ready as Robbie and Katie are soon married amid traditional confusion and tears. The lost family dog, Tramp, returns in time to join the family in the front pew.

Robbie and Katie come home from their honeymoon to face the problems of newlyweds in a previously all-male household. Katie finds her role difficult, for Charley insists on continuing as the family cook and attending to all the laundry. Robbie becomes worried about her frequent weeping spells.

For their fourth week wedding anniversary, Katie decides to earn some money for an expensive gift for Robbie by taking a one week job as a tea-room waitress. Robbie lunches at the tea-room and finds Katie, who has taken over as a last-minute replacement for the cigarette girl, in an abbreviated costume.

At school, Ernie meets Mike, who offers to play with him, but the family is exasperated to know Mike likes tomboyish pranks. Then there's a problem persuading Ernie to accept his new friend when he learns that she's really a girl.

Attractive lady engineer Eileen Talbot is assigned to help Steve Douglas on a rush project in his office, and she applies her many talents to assure romantic, as well as technical success. Only level headed Katie recognizes her as a manipulating female long before the gullible male Douglases do.

Chip learns the meaning of empathy when he helps Ernie out of a predicament when he somehow winds up with two dates with two different girls for the same dance, when he doesn't even like girls to start with.

One stormy night while Steve is in San Francisco, Katie is alone in the Douglas house while the rest of the family is attending a ballgame. Her tenseness builds as late in the night she hears a scary rythmic noise, and hysterically calls Steve to report that the family has not yet returned and that she hears a loud thumping sound.

Chip manages to outwit the machine age when a computer is used to select partners for picnic dates for the boys in his class and girls from another school. He is soon startled to find that his date, although sweet and likeable, is six feet tall.

Katie is worried when Steve invites her visiting Aunt to spend a week at the house while he is out of town. Before long, she is molding the entire household into her image of a cultured family. When she slips some money under Katie's pillow, the girl angrily announces that this behaviour cannot continue.

When minor irritations arise in the Douglas household, Robbie and Katie move temporarily into a borrowed apartment while their friends are away. Their life is complicated by the absence of a coffee pot, a pull-down bed that won't go up and the lack of a television set.

Chip Douglas is so nervous about taking his driving test that his new sister in law Katie decides to help by taking the test with him. Soon after they both get their driving licenses the family car collects a big scratch, but neither will plead guilty.

Chip invites his neighbour's long-haired, guitar playing boy from Liverpool as a key addition to his off-key rock and roll band. The English lad's soft, folksong guitar is a disappointment and obviously won't work with the raucous amplified trio, but he helps them to win a trophy in an amateur talent contest.

With his father Steve busy over the weekend, Chip suggests that newlyweds Robbie and Katie act as chaperones to him and his friends at a mountain cabin. At Katie's insistence, Robbie keeps strict checks on the three teenage couples.

Robbie Douglas displays a bit of jealousy when his bride innocently agrees to tutor a handsome student. Later, Katie confides to Uncle Charley that he was once her steady boyfriend, and Charley off-handedly warns Katie to be careful because Robbie has a jealous nature.

Katie tearfully complains when Uncle Charley makes her feel unnecessary in the Douglas household. Steve speaks to Charley who is flabbergasted at the accusation, but immediately makes amends. Meanwhile, Chip is on a five-man school committee; four of the 'men' are girls and they won't let him open his mouth.

A series of strange coincidences make young Ernie feel he's a jinx to anyone he contacts, but his father assures him that he has a loyal family who loves him in spite all of his trouble, and that they will stick by him no matter what.

Bored because he has been left at home alone on a day off from school, Ernie goes on a search for movie stars. The boy loses his footing on a steep path and falls into Zsa Zsa Gabor's swimming pool in Beverly Hills. The glamorous lady invites him in until his clothes dry and later takes him to a real movie studio. Now the whole family as well as the police are searching for Ernie.

Uncle Charley is talked into buying an 11 year old trotting horse in the hopes of capturing old racing glories. The family is delighted when they hear that the horse, driven by Uncle Charley, has qualified for a race after winning a trial competition.

Robbie goes to Camp Roberts for two weeks military reserve training. At home, Steve becomes alarmed when he sees Charley's card telling him that he and the boys who are camping at Yosemite, plan to look Robbie up at camp. But he arrives too late to divert them and one-by-one each member of the family is inadvertently caught as a military prisoner.

Dressed as a chorine named Apple Annie at his Lodge 'Frolics' night, a weary Uncle Charley awakens from a nap after a matinee performance and is forced to walk home and is arrested by the police for hitting a flirtatious man.

Ernie remains at home with Uncle Charley while the rest of the family travel to various locations. Charley invites an old friend to dinner, believing him to be down and out. However, Ernie immediately identifies their guest as a famous television sherriff and he invites the two to the studio.

The Douglas family cancels a camping trip to play host to unexpected Chinese friends from Bryant Park who are en route to Hong Kong and this ultimately upsets their Chinese relatives when they are asked to stay overnight.

The first time Robbie and Katie entertain at home they imperil the marriage of two close friends, Denise and Larry. Denise insists on playing a game in which each player tells what he dislikes about the other. After various uncomfortable truths are revealed, Denise angrily storms out insisting on a marital separation.

Steve Douglas is promoted to head up the Airflight Helicopter Division and the unmarried female employees quickly check and discover that he's a widower. Robbie's wife Katie takes a tour and Uncle Charley passes his girlfriend off as Steve's wife. When two Mrs. Douglases visit Steve at his new job, his employees suspect that he's a bigamist.

Uncle Charley persists in singing an old song about a guy who steals his best friend's girl. Chip listens with some sorrow but there is a misunderstanding that almost ruins the friendship between Ernie and his pal when Shorty sees Ernie walking to the movies with a new girl in the neighborhood.

Ernie and his friends sell two used tires they found in the family storage room so they can buy a water rifle, but they cease to enjoy their 'cops and robbers' games when the real cops turn up after Uncle Charley calls them.

While the family is doing some spring cleaning, Katie faints behind the couch. Soon her mother's intuition brings her to the house and she announces that Katie is going to be a mother. Once it is confirmed by a doctor, the family dotes on Katie, but seems to ignore the father to be.

Controversy erupts in the Douglas household over the selection of a doctor for Katie during her pregnancy. While Robbie and Katie want to choose their own doctor, Katie's mother insists on making an appointment with the Miller family doctor. Meanwhile, Steve stands in for an absent Robbie at his first baby class.

The baby stirs inside Katie and Robbie feels its movement and suddenly sheds his youthful ways to become very much the sober and altogether too serious expectant father. Meanwhile, fatherhood is taking a different approach when Tramp's puppies to the next door neighbor's dog Francis, are about to be born.

Because he is about to become a Grandfather, Steve has an easier time working out an important Air Force contract with a hard-shelled General. By watching the way Katie walks, the General predicts that she will have a baby boy. Meanwhile Ernie decides to run for class President at school.

When Robbie and Katie announce that they might hire a baby nurse, Uncle Charley is confident they will ask him. When they don't, he embarks on a marathon of baby sitting so he can learn the ropes by hiring himself out as a professional baby sitter.

In an advanced stage of pregnancy, Katie suffers qualms about her looks that are as out of proportion as her figure. She is temporarily distressed by her hugeness until she learns from her doctor that she is going to have more than one baby.

The day -- or rather the night -- of the big event finds expectant mother Katie quite calm, and Steve and Uncle Charley quite the opposite, and a hapless father to be off on Army manouvres. At the hospital, Katie gives birth to identical triplet boys and Steve must adjust to the fact that he is a Grandfather, three times over.

As the triplets come home from the hospital their names are announced by the happy parents: Robbie Jr, Charley and Steve II. Their father Robbie finds that he is totally unprepared for all of the attention that the infants attract.

It may not be poker, but nine in the Douglas family is a full house. Feeling somewhat responsible, Robbie decides to quit school in order to pursue work full time and find a new home for his family. A wise school counsellor takes steps to discourage the move. Meanwhile Steve designs some plans for an extension to the house to accomodate the babies further.

Robbie and Katie have been invited to a High School reunion and they are reluctant to leave their babies with an unknown sitter as everyone in the family is otherwise busy. They hire a professional sitter that is recommended by the family doctor.

On the rebound after his girlfriend Sally suddenly marries another younger man, Uncle Charley acquires many new lady friends when Katie schemes to put the wind back in the lovable old windbag's sails.

With three babies to look after, Dr. Osborne says Katie is completely exhausted and he prescribes a couple of days bed rest. She flies to Santa Barbara to be with her mother. While she is away the family must hire three cleaning ladies to restore the house back to normal.

The contractor that Steve hires to add a baby alcove to Robbie and Katie's room leaves much to be desired. He displays all the charm of a top sergeant and is putty in Katie's hands, but is exasperatingly gruff and non co-operative to the males in the Douglas home.

Steve meets an attractive widow who seems to be very interested in him but suddenly she turns cool towards his intentions. The family does its best to give the impression that Steve isn't really as old as he seems.

Although Katie confidently calls the look-alike triplets by name, other members of the family doubt her accuracy, and when Steve helpfully bathes them, she admits that she can no longer tell them apart because he washed off the inkdots put on their feet. They must be taken back to the hospital for proper identification.

Chip and his girlfriend announce to a startled Douglas family that they plan to marry and continue high school. Disapproving, Steve visits the girl's parents but they decide not to forbid the marriage but wait for further developments. When Katie becomes ill and Robbie takes her to the doctor, Chip and Debbie are left with the triplets for some hectic hours.

The Douglases feel that Steve is becoming sedentary, not knowing that he's just been assigned to help capture some enemy agents, but things get rough when he's taken to a Greenwich Village cocktail party where the spies start shooting when they find him hiding in the bathtub.

Steve Douglas gives Chip a well-preserved second hand car for his 16th birthday but he is astounded by his son's unenthusiastic reaction; he is embarrassed to drive it, and parks it a long way from school so he won't be recognized as the old car's owner.

Steve's old Chinese friend transfers to Los Angeles and happily renews his friendship with the Douglases. He confides in Steve and Charley that he is concerned about the man his daughter has married - an aparently aimless hippie with long hair.

Chip and Ernie observe their married older brother, Robbie, in the company of a glamorous woman. The boys report the upsetting situation to their father Steve, who assures them he has trust in Robbie and urges them to maintain confidence in their older brother too.

Young Ernie is crushed when he learns that his next door neighbors are selling their house, and his best friend is leaving the neighbourhood. Pending their separation, the two boys are together day and night; the Douglases give Gordon a touching farewell party.

Ernie and his girlfriend are dismayed when Uncle Charley and her grandmother don't act like old folks after they meet at a school band contest. Ernie confides in his amused family about his concern over Uncle Charley's behaviour.

Ernie bemoans the task of writing in Spanish to a Latin-American pen pal but she then astonishes him by accepting a dinner invitation by cablegram; Maria is the daughter of a high ranking diplomat.

After being the only one in his class to choose the correct color in a card test, Ernie is convinced he has extra sensory perception. He predicts disaster for Robbie and Katie if they keep an appointment for the babies with Dr. Osborne.

Steve's co-worker and golf buddy, suggests that Steve and two of his sons, go to the company picnic with him and his two children. To the parents' dismay, the youngsters take an immediate dislike for each other.

Ernie attempts to remould his image after a classmate he is attracted to, Margaret, refuses to give him a second look. Margaret, however, prefers Roger and is obviously disappointed when Ernie is selected as her partner in a poem recitation.

When old Bryant Park friends move into the neighbourhood, they renew their friendship with the Douglases at a family barbecue where Steve is cast in the role of marriage counselor by the eldest son who turns to him for help in saving his marriage.

Ernie's writing ability lands him in the dreaded special English class with its strict but efficient teacher. Her reputation as an ogre keeps him so uncomfortable that he not only performs badly in oral recitation but in his written work as well.

Robbie and Katie move into an apartment on the next block and widower Steve Douglas becomes the target of Katie's relentless matchmaking. However, Steve meets a remarkable woman in a high school corridor and the two are quickly attracted to each other.

Robbie needs to talk to his dad-who seems unreachable

The whole Douglas clan conspires to encourage Steve's romance with the lady in question, Barbara Harper. After dinner, Steve and Barbara go back to her house where Steve is predictably nervous around her. They are both serious about their relationship, but neither of them realizes it.

Everyone (Except Barbara) knows Steve is going to propose to Barbara

With the ring finally on her finger, Steve and Barbara's engagement is exciting for everyone except Barbara's five year old daughter who isn't sure she wants to share her mother. Meanwhile, Barbara employs her considerable store of diplomacy in an effort to gain acceptance by Steve's family.

Steve and Barbara have different ideas on how their wedding should go.

After a series of events at which the Bride and Groom wonder if they are doing the right thing, Steve and Barbara have an argument serious enough for them to consider cancelling their wedding.

On Steve's wedding day the groom is predictably nervous. Recalling certain mishaps from his own big day, super efficient Robbie determines that his own father's wedding will be perfect and after a few hours of hectic, last-minute preparations, Steve and Barbara are married in a simple church ceremony.

Steve and Barbara's Honeymoon in a remote fishing village is bustling with hordes of other, younger honeymooners. They end up counselling several couples who are not adjusting to married life. When a bottle of champagne arrives from the family back in Los Angeles, the other honeymooners realise that Steve and Barbara are indeed honeymooners as well.

With Steve and Barbara due back from their honeymoon in Mexico, Katie forces Robbie to lecture Uncle Charley on politeness, and the result of his very puzzling behaviour nearly drives Barbara out of her mind.

Little Dodie feels out of place among her three stepbrothers and her often grumpy uncle, and discovers that being a member of the Douglas family can be a rough and tumble proposition.

When Katie panics as she detects a few gray hairs in her youthful head, a family crisis is not far away. She further worries Robbie by suggesting they discuss preparation of life insurance and superannuation.

When her brothers have more pressing commitments, Steve gets cast in Dodie's school play as a tree, more or less proving Robbie's point that females are instinctive manipulators.

Barbara faces a fiasco when she prepares her first dinner party for Steve's business associates and their wives. The event has Barbara worried to death after a few schedule changes ruin most of her plans. Finally it is Barbara's mother who saves the day.

Barbara is jealous when a glamorous special secretary enters the lives of both Steve and his son, Robbie, and causes a double domestic crisis. Barbara ends up consoling a heartbroken young lady who is eventually fired from her position.

Little Dodie goes to the hospital for a tonsillectomy and insists that her new father stay overnight with her. Barbara understands because she knows that Dodie is finally accepting Steve as her real father. Meanwhile, Robbie and Katie go on a trip to Mexico and leave the triplets in care of the Douglases.

Hoping to renew her funloving friendship, Steve's old girlfriend from Bryant Park, who is now a rich divorcee, comes to town and gives Barbara a few jealous moments.

Robbie is asked to be the best man at the wedding of an old friend from Bryant Park. He decides to go back a week early to show Katie around the town where he grew up but ultimately makes a disappointing visit when he realises that time and years do change things.

Barbara tells her mother that she feels rejected when the boys never tell her their troubles and go to Steve or Charley instead. While Steve is away on business, she is forced to confront one of Chip's teachers when he and another student are accused of cheating in an exam.

Barbara feels that Uncle Charley is lonely playing his Cello, so she talks to a msuic store proprietress who invites three lady musicians to help join in a string quartet.

A Special time consuming project keeps Steve and son Robbie so pre-occupied that they are tired when they arrive home. After the project ends, the co-workers throw a celebration party and when Barbara and Katie arrive with supper for their hardworking spouses, and see a party in full swing, they storm out.

Young Ernie Douglas becomes the unwilling object of the affection of Dodie's six year old friend while Barbara is asked by the Board of Education to take a substitute teacher's job at a local high school. She finds her stepson Chip in the class and he embarrassingly becomes her prized pupil.

A bearded man of mystery confounds the Douglas family and the authorities alike, while Steve is working on a top priority project at home. Barbara soon identifies him as her former father-in-law.

Dodie calls upon her big brothers to help her fight her battles in the school playground when some girls say that Douglas is not her real name. Steve feels he should formally adopt Dodie to make it official but this only solves half of Dodie's problems.

Robbie and Katie have an unpleasant personality clash with the young couple who move into the next apartment in their building. Meanwhile, when Uncle Charley assures Dodie that Katie is her sister, she phones and leaves a message with Robbie. When he forgets to pass it on, a family crisis is not far away.

Chip turns on to economics and is enthralled by the latest book by his accounting teacher, and vows that he will become rich early in life by instituting a break-neck money earning schedule. Whilst working at several jobs, he doesn't take into account the expenses he begins to incur along the way to his goal.

Chip begins studying with a pretty co-ed whose disciplinarian father wants to know why her new friend is spending so much time with her. Meanwhile, on the eve of Steve and Barbara's first wedding anniversary, Dodie announces she is throwing a surprise party, but neglects to tell everyone when or where.

Uncle Charley and Barbara suspect that Chip and Polly are becoming serious about one another. Polly, unhappy at home because of her father's strictness, is afraid of losing Chip because of her parents' meddling. She asks Chip to elope, and taken aback, he asks his father for advice.

Barbara is flustered when she receives a phone call from a former college suitor, and is very apprehensive when Steve invites him to dinner. The entire family is anxious to meet her old flame, thus compounding her uneasiness.

Chip delights Polly with an expensive locket for her 18th Birthday and after their vague conversation, he thinks he's agreed to go steady, but Polly tells her mother that she has become engaged. Perturbed by her husband's probable reaction, Mrs. Williams arranges a luncheon to judge the seriousness of the matter.

Chip and Polly open a joint bank account and Chip takes on a box boy job at a supermarket to accumulate money for their future marriage. Later after she's had an argument with her father, Polly comes to the Douglases with her packed suitcase, but when Chip turns down the girl's offer to elope, she storms out.

Dressed as a cat for a costume party at the home of his employer in Bel Air, Steve goes for gasoline when his car stalls but the police arrest him as a burglar. Meanwhile, Polly notes that there is so much love in the Douglas household, that she just has to become a part of it.

Chip asks Steve's permission to elope, but before he grants it, he insists Chip give Mr. Williams the courtesy of asking his approval too. Chip goes to see Mr. Williams only to have him accusingly flaunt a private detective's report. Realizing that Polly's own father had hired a man to trail them, he storms out before asking for her hand.

Following their elopement to Las Vegas, newlyweds Chip and Polly are beset by nothing but trouble. The universal joint in their car gives out and they have to be towed into town. The hotel where Steve and Barbara stayed is no longer for honeymooners but for singles, and the newlyweds must spend their first night in separate rooms.

After Chip and Polly return from their honeymoon they spend a few days at the Douglases. Soon they move into their own college dormitory, and bridegroom Chip faces a father in law who refuses to speak to his newly married daughter.

Barbara becomes involved in presenting a fashion show for a woman's club luncheon, and Steve reluctantly agrees to become a model for a fashion show, but refuses at the last minute when he realizes he must wear a lacy, ruffled shirt and parade down a runway modelling it.

Chip becomes violently ill after eating Polly's cooking, and she learns from the family that Chip is allergic to some of the foods she's been preparing. Distressed, she feels it would be better for her husband if she left him.

Against his classmate's better judgement, Ernie uses the unwitting Douglas household as guinea pigs for an experiment assigned by his psychology teacher. He cuts inches off Uncle Charley's cane to make him think he is growing taller. Ernie soon finds his father Steve is a little less gullible.

Katie's mother gives Katie and Robbie a vacation by taking the triplets to St. Louis with her for a couple of weeks. Robbie figures that now is the perfect time to do all of the things they haven't been able to do when they had the boys to look after.

A boyhood friend from Bryant Park, rides his motorcycle back into Robbie's life and awakens Robbie's wunderlust with appealing tales of travel and adventure. Intrigued by Jim's stories of freedom, Rob agrees to take a holiday from Katie and the triplets.

Dodie and some of her girl classmates in the second grade get a big crush on Mr. Turley, their new teacher, and right away they make a batch of cookies for him. Dodie's crush begins to fade when she finds out that her Mr. Turley was once one of Barbara's students.

Barbara suspects that a promotion for Steve maybe in the works and as her suspicions become stronger, a routine investigation on Steve's family background turns up some rather startling information when it focuses on Uncle Charley.

Level-headed Katie becomes a jealous, suspicious wife when a pile of circumstantial evidence stacks up against Robbie, as she suspects him of seeing another woman.

Ernie and his friend Elmore both flunk their driving licence tests, while their dates for a dance both pass. Ernie and Elmore take part in a ruse to conceal this situation from their dates, but instead they end up in trouble with the law when they realise they are stranded after a date.

Ernie is left in charge for one day when Steve and Barbara are off to Chicago for a golf tournament while Uncle Charley attends a string music festival. Little Dodie and her friend take a shopping excursion into town but don't have enough money for the bus ride home.

Dodie studying piano, Margaret on the violin and Susan at clarinet, comprise the 'Rondelay trio' and Dodie tells Steve and Barbara the good news that they'll practice at the Douglas house for their upcoming recital.

The rear bumper of Ernie's car is struck by a teenage girl in a parking lot. Ernie's car suffers no real damage but the other car's fender is crumpled. Before very long, this involves Ernie in an ill-fated romance.

Barbara leaves Ernie in charge of looking after Dodie after she has to go shopping. However Dodie goes to her friend Drucilla's house, and when Barbara returns he cannot remember where she is. After Dodie is found, Barbara sends them both to their rooms for the day. Then Ernie and Dodie rebel when they feel that they've been unjustly punished.

Uncle Charley is elated when he gets word that his pugislistic shipmate and buddy is going to visit him in a few days. However, Charley is forced to concede that times and people do change when the tough-talking, bad mannered ex-sailor he once knew isn't so terrible anymore.

Rob is laid off from work, but decides to move with Katie and the boys to San Francisco to accept a job at another company. They move into an apartment and meet several other tenants. One of them suggests Rob is always tired from the burden of supporting his family. Feeling disheartened by this and other remarks, Katie thinks that Rob doesn't want her and the triplets anymore.

Steve's look-alike Scottish nobleman cousin Fergus, comes to America looking for a bride to take back to his hometown of Sithian Bridge and moves in on the entire Douglas family, much to the dismay of Uncle Charley.

When Uncle Charley learns that Fergus is looking for a wife to take back to Scotland to provide him with heirs to carry on the family name, he takes out an ad in the local newspaper in an effort to rid the Douglas home of his nemesis.

Steve's Scottish cousin Fergus, after only one date with Bowling Alley Cocktail Waitress Terri Dowling, proposes but gets turned down by her. She feels inadequate to return to Scotland as royalty, but is eventually persuaded by Steve.

The wedding day for Steve's Scottish cousin and bowling alley waitress Terri Dowling finally arrives amid the traditional confusion and tears. They leave for a three day honeymoon in Las Vegas but Uncle Charley is worried about the lack of thankyou from them.

Having no choice, Steve takes the triplets to work where a secretary offers to take them home until he is finished. However he accidentally loses her details and when she finally rings, she announces that the boys have run out the front door, much to Steve's annoyance.

Chip complains about Polly's lack of sales resistance because they have an apartment full of useless things. But she is trapped by a salesman into giving a dinner party for eight people in exchange for a free set of cookware.

Uncle Charley leaves for a week's vacation in San Francisco but meanwhile, birthdays disrupt the Douglas household, when Barbara, Katie and Polly turn against their spouses over the men's apparent oversight.

Childless young marrieds Chip and Polly Douglas suddenly find themselvs the temporary guardians of several young children including the triplets, when Katie flies to Peru for a weekend rendezvous with Robbie. Meanwhile, Steve, Barbara and Charley go on a camping trip and Barbara isn't exactly Mrs. Daniel Boone -- as Steve eventually finds out.

Barbara's natural enthusiasm bubbles over into an embarrassing evening for Steve and some of his business associates. Barbara explains to Steve that adrenalin gets her going in competition, and she is apprehensive when he is asked to play in his work's bowling team for fear she will make him lose concentration.

Katie Douglas takes a job singing in a small coffee house, but both Steve and Charley have their doubts about the man she is going to work for. After meeting the owner's wife, they realise she is in very good hands.

Polly fears that Chip is losing interest in her as a woman, and she takes some very dramatic steps to remedy the situation. Ernie gets the impression that the marriage is on the rocks when he finds out she is sneaking away from school and making mysterious calls to a man named Andre.

Uncle Charley is persuaded to fill in as a Cello teacher to a small group of reluctant young music students. His teaching methods leave much to be desired as he makes sure that they practice and practice for the upcoming recital.

Katie's triplets are spotted by a talent scout for a production company and are selected to appear in a television commercial. The temperemental Director yells when the boys misbehave and make a shambles of the studio. Grandfather Steve is asked to replace the actor doing the same so the boys will feel at ease.

Katie decides to put the triplets in a nursery school during the day when she fills in for a friend as a secretary, a move that enrages Uncle Charley when he hears about it. Later, it becomes apparent that he goes missing every afternoon causing the family to worry.

A little first grader named Alfred develops a big crush on third grader Dodie Douglas -- much to her displeasure. When Uncle Charley invites him to dinner, Dodie tries to fake illness to get out of it. Very soon Alfred's mother reports that he is missing.

When the Douglas men feel sorry for Katie because of her husband's continued absence, they proceed to overwhelm her with attention by each one of them taking her out to the same restaurant each night.

Dodie commits the entire Douglas family to a time consuming project - the awesome task of getting a four foot tall bag of Peanuts into small little sacks which they hope to sell at the school fair to raise money for Korean orphans.

Steve suddenly becomes accident-prone when his youngest son Ernie tries to discover by graph and observation how the moon's lunar phases affect people's behaviour.

While Steve becomes pre-occupied with a time-consuming project named Taurus, Barbara blossoms forth as a Championship Cook. Her recipe for 'Tangy Tidbits' wins her a trip to Hawaii for the final cookout.

Although Barbara is feeling very ill, she is saddled with the responsibility of looking after the entire Douglas household but in the end, to escape the pressure, she just walks out leaving Steve in a worried state.

The Douglas family becomes concerned about Dodie's despondency when Tramp, the ageing family mongrel, keeps disappearing at night. Meanwhile, Uncle Charley makes her a rag-doll and names it Arfie.

Katie becomes disillusioned about life without Robbie, and seriously thinks about divorce after speaking with another of the wives in the same situation. Meanwhile, Dodie and her two pals campaign to Barbara to let them have a slumber party.

Chip decides to quit his Chemical Engineering studies in favour of a rock music career when he meets up with a former friend who is now a big star. When Barbara visits John in the studio she is baffled by all the switches on the recording console, and realises that professional musicians know what they're doing, so how will Chip handle it?

Steve's boss Bob Anderson and his wife share 'Where-did-we-go-wrong?' panic as they struggle to communicate with their son; Steve and Barbara are the counselors. The teenager is rude and disrespectful to his parents but his insolence doesn't bother them nearly as much as not knowing if he is taking drugs.