When Sheri's friend Tom comes for a visit, Sheri expects Dean to be very jealous, as usual. However, he trusts Sheri--until her complicated series of lies is exposed. Meanwhile, Mel and Dean plan to beat Tom in a poker game, but Bobbi and Malena end up being the big winners when they join the game.

Reggie learns that Bobbi still wants him when his phone's star-69 feature reveals that she tried to contact him. Meanwhile, Sheri and Dean discover the advantages of being expectant parents when Sheri dons a fake pregnancy tummy; and Malena fumes when she finds out that Mel never mailed the thank-you notes from their wedding.

Sheri's wayward teen-age sister Amber shows up and promptly steals Dean's company car. Meanwhile, things get heared as Bobbi prepares to begin her single life and Reggie tries to talk her out of moving.

When baby-making efforts put Dean and Sheri's lovemaking on a strict schedule, a frustrated Dean withdraws from his wife, scaring Sheri into doubting the stability of their marriage. Meanwhile, Bobbi and Reggie impulsively decide to live together, leading Mel and Malena to give the couple some questionable advice.

When Dean's brother Andy claims he needs one of Dean's kidneys, Sheri smells a scam and tells Dean to refuse. Meanwhile, Malena is jealous when she learns Mel corresponds regularly with an old flame. When Mel refuses to understand her discomfort, Malena turns to Sheri's mom Ronnie for advice.

Reggie tells Dean and Mel that he plans to propose to Bobbi after seeing her in an unflattering way that didn't repulse him. Meanwhile, Dean repaints the kitchen in a shade of pink and Sheri doesn't have the heart to tell him she hates it.

Malena feels left out after Sheri spends her free time with another friend, which leads to an embarrassing public outburst. Meanwhile, Mel abuses Dean's generosity at work.

Dean unwittingly annoys Sheri by not paying close enough attention to her. Meanwhile, the wedding march might not be played after all when an argument between Reggie and Bobbi jeopardizes their nuptials. The off-again, on-again couple's trip down the aisle is put on hold after they each heed contradictory advice on how to celebrate the festive occasion. Malena persuades Bobbi to change the venue from the hotel reception room they had already booked to another building's terrace overlooking the city. Mel tells Reggie to scrap their original plans for a cash bar. The final clash comes when the bride and groom have a contentious war of words over their wedding song.

The fourth season concludes as Dean takes Malena and Mel to the hospital when the mother-to-be goes into labor. Once there, Malena tells her husband to keep his video camera rolling, no matter what happens. Meanwhile, Sheri arrives at the hospital and aggravates Dean.

Malena and Mel's newborn baby is home from the hospital but its constantly crying keeps them in a panic. Meanwhile, Dean and Sheri's moments of passion in the hospital make him think his wife is coming back to him, but she dismisses it as a mistake.