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You can buy "The War with Grandpa" on Amazon Video, Rakuten TV, Apple TV, Google Play Movies, YouTube as download or rent it on Amazon Video, Rakuten TV, Google Play Movies, YouTube online.
Peter is thrilled that his Grandpa is coming to live with his family. That is, until Grandpa moves into Peter's room, forcing him upstairs into the creepy attic. And though he loves his Grandpa, he wants his room back - so he has no choice but to declare war.