Dr. Tom and Laura Larsen are the parents of Robbie Larsen. Not much is known about them, but it it appears they have money. Mrs. Larsen is also a former gymnast. She had Robbie train for eight hours a day after eight hours of school, even using their ship's gymnasium while on vacation to train him. However, when Robbie vanished off the ship, they tracked him down to The Castaways Resort where Gilligan was helping him hide out in the the woods before returning home.