The action will revolve around the Willoughby family, a large family in which parents are too busy romantically to care for their four children: Tim, Jane and the Barnaby twins. One day, faced with another trouble because of their parents, Jane suggests that the brothers send their selfish mother and father on a fictional vacation, secretly hoping to get rid of them forever. When unsuspecting parents go on vacation, the children, sincerely happy that their cunning plan has worked, arrange a Grand celebration. But very soon Tim, Jane and the Barnaby kids get into serious trouble, which, as it turns out, is difficult to solve without the help of adults.