Vivian's mother is being courted by Dave's father. Vivian, is attending a girl's high school, while Dave is about to graduate from college. The old people deceive each other by saying they have a child who is about ten or eleven years old. Vivian's Ma writes her a letter to come home, telling her to don a child's outfit, while the Colonel writes the same to Dave. The young people obey orders and things begin to happen round the house. Eventually they tire of playing kids and don their regular clothing. Dave discovers Vivian and chases her; it winds up by his being thrown into the lake. Finally the old folks admit their deception and decide that their love for each other is still the same, and Vivian and Dave become good friends.