The Petes are entrusted with the key to the house while Mom and Dad go away on a trip for two days. Just when it looks like their plan to stage the ultimate bicycle race around the house (The Wrigley 500) is about to materialize, Big Pete is struck by hormones and instead chooses to vie for the attention of his latest sweet-heart, Margie Corsall. Little Pete sells the house in retaliation to the nicest family ever, the Krechmars. Big Pete tries to set things right with his brother and they attempt to regain ownership of the house before Mom and Dad return.