The award-winning children's classic - now a major film Peter was so excited that Grandpa was coming to live with his family - but he hadn't expected Grandpa to take his room... Peter loves his Grandpa, but now he feels he has only one choice: to declare war! With the help of his friends, Peter devises outrageous plans to make Grandpa surrender the room. But Grandpa is tougher than he looks. Rather than give in, Grandpa plans to get even. They used to be such great pals. Has their war gone too far?