Joel tries to use his bargaining skills to get Mia the baby stroller of her dreams; Maddie worries she's losing her passion to be a lawyer.
Mia and Casey try to reschedule their wedding until after their baby is born; Ben learns that Joel is worried about crying during his wedding toast.
After discovering Mia can't dance very well, Casey tries to conceal his skills; Ben runs into Larry King and asks him for relationship advice.
Maddie gets a feeling that the story Mia tells about how she and Casey met is not true; Vicky and Joel have Mia and Casey's engagement party at the country club and use it to promote Joel's campaign to be the club's treasurer
Maddie lies about getting laid off from the law firm; Mia and Casey suspect there is a hidden message in the children's books Vicky donated to them.
Casey's ex-girlfriend wants the couch she loaned him when they were still together; Maddie updates Vicky and Joel's wills.
The job interview-bound Casey, unaware that bad luck always follows the wearer of a particular leather jacket, borrows it without telling anyone. Everyone recalls their own bad experience while wearing the jacket, including Ben, who accidentally dropped a blanket on New York Yankee outfielder Nick Swisher when he was trying to catch a fly ball.
Maddie and Mia agree that they are not looking forward to the annual tradition of spending Christmas with everyone at the family lake house, so Mia and Casey use the pregnancy as their excuse and Maddie comes up with her own tall tale.
Mia and Casey offer to give Maddie a Halloween-free party for her birthday, which falls on the same day as the holiday; Mia finds a mysterious videotape among Casey's things.
Maddie plans to trick Vicky into choosing not to send frivolous emails to Ben.
Casey implements a plan to avoid fights with Mia; Maddie inadvertently exposes a fault in her relationship with Ben.
Ben is secretly hurt when he is left out of the Putney family's Christmas card photo; Mia and Casey ask Maddie and Ben to be the people who say ``no'' to their future child.
Maddie and Ben have been dating for nine years and they know each other inside and out. Maddie's younger sister, Mia, has been dating Casey for seven weeks. With a shared c'est la vie attitude, Mia and Casey announce they're getting married and having a baby. It's news that throws Maddie for a loop. Surprisingly, the girls' parents, who have recently adopted a carpe diem sort of philosophy, couldn't be more pleased.