Except for a brief period as a pre-teen and a short stint teaching middle school, I’ve spent most of my life avoiding twelve-year-old boys. This makes me the wrong audience for the new feature film, War with Grandpa. True, filmmakers try to lure a broader, family audience that includes adults by hiring a terrific older cast. Robert de Niro plays the title’s Grandpa, his mob movie credentials making him a tough opponent for anyone, even a twelve-year-old boy. Also playing to their movie track records, Christopher Walken and Cheech Marin step in with their own brands of humor.