It's summer vacation and Josh and Sabrina's parents crush their dreams by sending them to their grandparents' house while they go to Vegas on a second honeymoon. The kids prepare for the biggest nightmare ever and decide to stick together to survive. However, after the hard time with all the boring activities their grandparents forced them to go through, Josh and Sabrina find out their grandparents' true identities. For their surprise, their grandparents were actually cool and funny after all, and were pretending to be the responsible and strict grandparents they never were because their son asked them to do so.
