Sally, Kurt, and Chris are three perfect examples of ""The Boomerang Generation,"" which, as the name implies, refers to kids who grow up, leave home for college, and then come right back to the nest. For their younger sister, 15-year-old Brooke Franklin, the sociological phenomenon is a lifesaver since her parents are always away on vacation. Left to fend for themselves by their globetrotting parents, the four create an unusual surrogate family marked by the usual sibling rivalries and power plays. Somehow they manage to overcome the pettiness, however, in a uniquely genuine attempt to create a nuclear family in the absence of one.

When Chris sees Brooke's boyfriend, Scott, kissing another girl, he tells Kurt and Sally and they try to get Scott to confess.

Things quickly get out of control when Chris helps Brooke throw a party and invites the band ""Dropline"" to the house. Meanwhile, Sally tries to keep the bash a secret from Kurt by taking him with her on a double date.

The annual tradition of pranks between rival high schools continues on the eve of Homecoming as Brooke, Chris and Kurt get involved in an egg fight with Brooke's rival high school. Meanwhile, Sally spends her Friday night baking cupcakes for the Homecoming committee but receives help from a fellow volunteer (""American Idols'"" Justin Guarini).

When Kurt (Joseph Lawrence), Sally (Sasha Barrese) and Chris (Kyle Howard) suspect that Brooke (Margo Harshman) has been smoking cigarettes, the town gossip calls the kids' parents in Arizona, and they threaten to return home.