After turning down Bridget's request to throw a "harmless" after-prom party in a hotel room, Cate decides to throw a school-sanctioned party at the house - which totally embarrasses her kids. Meanwhile, Kerry tries to make a political statement by inviting a girl to the prom, and Rory is overjoyed when a hot senior asks him to the dance.

After Principal Gibb and Cate fall asleep at the house while watching a movie, the family catches them and falsely assumes that the two are having a relationship. Meanwhile, Bridget, Kerry, Rory and C.J. are forced to go ice-fishing with Jim in order to spend quality time with their grandfather - but unbeknownst to them, Jim would much rather be left alone and is forced to keep up a happy fagade.