Multi-millionaire Phillip Drummond, who has agreed to the death-bed wish of his housekeeper to raise her two small sons as his own, welcomes 8-year-old Arnold and 12-year-old Willis into his lavish penthouse. Anxious to make them feel at home, he showers them with gifts and love -- and is puzzled when he learns that the boys are planning to sneak from the lap of luxury back to Harlem. Aiding Drummond in his effort to make the street-wise, ghetto youngsters feel welcome in the affluent white world are Drummond's new housekeeper Mrs. Garrett and his 13-year-old daughter Kimberly.

Arnold's eavesdropping leads to trouble when a misunderstanding causes Willis and him to think that Mr. Drummond no longer wants them around; he has heard Drummond tell a social worker that ""black children belong with black families.""

Mr. Drummond's socialite and rather snobbish mother arrives and finds there's a lot she doesn't like about her son's new sons, but she soon learns a valuable lesson about what's really important in a person.

When Mr. Drummond tries to get Arnold and Willis into an exclusive prep school, it turns out to be just a little too exclusive for everyone's tastes.

Arnold ignores warnings and continues to drop water balloons from the balcony. Mr. Drummond's decision to punish Arnold for the prank with a spanking becomes a learning lesson for Willis too, when he insists that he be the one to spank Arnold -- but where's Arnold?

When Arnold loses his favorite doll, he makes sure that his misery is shared equally by the various members of his household, who soon try everything to get it back.

When Arnold is in trouble for putting his goldfish in Mr. Drummond's hot tub, Willis insists that it is wrong to convict him without a trial. The whole family, with Mrs. Garrett as judge, comes up with an important verdict.

מר דראמונד מעיר בטעות את ארנולד, ויליס ושאר המשפחה, ויחד הם מעלים זכרונות לציון 56 ימים שהם גרים יחד.

מר דראמונד מעיר בטעות את ארנולד, ויליס ושאר המשפחה ויחד הם מעלים זכרונות לציון 56 ימים שהם גרים יחד.

Willis puts Arnold in training to fight the local bully, but Mr. Drummond insists more civilized solutions be employed.

Willis invites his neighborhood club from Harlem to visit, but things get out of hand when he tries to impress them with his new wealth.

Mr. Drummond's intention to marry an attractive widow doesn't meet with his children's approval, and Arnold, Willis and Kimberly devise a scheme they hope will turn his ""romantic"" proposal into a disaster.

A lonely Arnold comes up with a method of gaining his family's attention. Unfortunately his plan works a little too well; he ends up with everyone's attention, including the family doctor.

קרובת משפחה של ויליס וארנולד מגיעה לביקור פתע וכשהיא רואה איך הילדים חיים בעושר בפנטהאוז המפואר, היא עושה הכול כדי להאריך את הביקור שלה.

כשהילדים מקבלים תעודות והציונים של ויליס טעונים שיפור, מר דראמונד שוכר מורה פרטי. על אף שהומלץ בחום, המורה הפרטי לא בדיוק שגרתי.

ויליס מנסה לעבוד על פרוייקט הצילום אבל ארנולד מציק לו. ויליס מבקש ממר דראמונד לעבור לחדר לבד, וכשמר דראמונד מסרב - ויליס בוחר פתרון יצירתי.

When Mrs. Garrett decides her life as a housekeeper is unfulfilling, she ends up being a guest in the Drummond home, and then makes an important decision concerning the future.

חשקה נפשו של ויליס בזוג סקטים חדשים, אבל המחיר גבוה. במקום להיעזר במר דראמונד, ויליס מחליט להרוויח את הכסף בעצמו ומוצא עבודה בתחנת דלק.

מר דראמונד צריך לנסוע לנסיעת עסקים לפורטלנד, ומחליט לנצל זאת כדי לצאת עם כל המשפחה לחופשת אביב, אבל כשארנולד שומע שהם יצטרכו לטוס לשם, הוא לא מוכן לבוא.

The stars of ""Diff'rent Strokes"" and ""Hello, Larry"" get together in a special, hilarious hour in which Phillip Drummond realizes that the purchase of a Portland radio station could mean the loss of a job for his old friend Larry Alder.

ארנולד מסתכל דרך הטלסקופ שלו וצופה בשוד לאור יום. כשהוא מספר על כך למשפחה וכולם חושבים שהוא סתם ממציא סיפורים, הוא מחליט לקחת את העניינים לידיים.

Willis is hurt when he thinks his family has forgotten his upcoming birthday. After dropping several unsubtle hints he discovers that not only has everyone remembered, but also his fondest wish has been granted -- a birthday party in his old Harlem neighborhood.

Mrs. Garrett visits Kimberly's school and takes on its pushy principal with surprising results.