“She was silly,” Grandpa said softly. “That’s why I miss her.”

The story centers on (Oakes Fegley), a young boy who is forced to move out of his beloved bedroom and into the "creepy" attic when his grandfather, Ed ( Robert De Niro ), moves in with the family. Determined to get his room back, Peter declares an all-out "war" and uses a series of increasingly elaborate pranks to try and force his grandpa to surrender. However, Grandpa Ed turns out to be much tougher than he looks and recruits his own team of senior friends to strike back. Star-Studded Cast