Also Read: Robert De Niro, Anne Hathaway Join Cate Blanchett in 'Armageddon Time'Also starring alongside De Niro and Fegley are Christopher Walken, Uma Thurman, Laura Marano, Rob Riggle, Cheech Marin and Jane Seymour. “The War With Grandpa” was written by Matt Ember and Tom Astle and features the original song “Point of War” by cast member Laura Marano.101 Studios will release the movie in partnership with financier Brookdale Studios.