Newlyweds George and Katherine Papadopolis return from their honeymoon to find themselves the guardians of seven-year-old Webster Long, orphaned son of one of George's old football teammates.

Because his real birthday is July 15, Webster lies about the day of his birthday so that he can have a party at school. Katherine and George are unaware of this until Katherine finds his vaccination records which reveal the truth.

Webster tries out for a community league football team. After the coach finds out who his father and guardian are, he makes the team.

While Katherine struggles to find common interests with Webster, his friend Melanie Easton runs away from home-by staying under Webster's bed-because she is jealous of the attention her new baby sister gets from her mother.

Webster wants a baby brother or sister so he enlists the aid of a playmate to make a baby.

With pressure building on Webster due to tests in math, spelling, and karate, he starts wetting the bed. When Katherine and George go into his room to find the missing sheets, he considers this a breach of trust.

George mysteriously refuses to give his blessing to a reunion between Webster and his Uncle Phillip.

A worried Webster feels responsible for Jerry's decision to quit his job as Katherine's assistant and open his own gym.

Webster's fear that his classmates will laugh at his composition of his crush on his teacher.

Webster is delighted when George, Katherine and his Uncle Phillip all want to adopt him, but he's torn when he learns they can't all live together.