War with Grandpa starts

Peter and his grandpa used to be very close, but when Grandpa Jack  moves in with the family, Peter is forced to give up his most prized  possession: his bedroom. Peter will stop at nothing to get his room  back, scheming with friends to devise a series of pranks to drive him  out. However, grandpa doesn't give up easily, and it turns into an all-out war between the two.