Peter is so mad that his grandpa is coming to live in his house with him because his grandfather will get his room and Peter has to move upstairs into the guest room. Peters grandfather has a bad leg so he can’t walk up 3 flights of stairs to get to the guest room, that’s why he’s moving into Peters room.I predict that Peter and his grandfather will start to prank each other. I think that Peter will start to like his new room and at the end of the book grandpas leg will get better and they will switch rooms which means that Peter will get his room back.