Having learned that her sister Maggie is having marital problems, Cate is nevertheless not too thrilled when Paul invites Maggie to stay at the house. Meanwhile, Paul and Cate are impressed with how mature Bridget has become after they agreed to let her go out with neighbor Donny Doyle, who is home from the Naval Academy. Bridget and Kerry wonder if Kyle has ulterior motives when he befriends Rory.

The rivalry between Cate and Maggie comes to a boiling point when Maggie gets a sexy, new makeover and gives Bridget a water bra as a gift. Tensions between the Hennessy sisters mount when Kerry and Kyle begin dating, while Bridget's popularity takes a nosedive after she dissed her friends for Donny. Paul becomes concerned when he finds an empty pregnancy test kit.