Majestyk’s review published on Letterboxd:
The War with Grandpa is a kids movie that kind of works for adults as well. Don't expect any clever things in here. It's all quite dumb. But that's the charm of the film. And if you go along with it, it's actually a lot of fun. Robert DeNiro is pretty good. He is the best actor of all time in my opinion but he has been in a lot of bad movies for the past 20 years. That being said, he carries the movie with ease.
It was nice to see Ums Thurman again. She was good as well. The supporting cast was funny and memorable including Christopher Walken and Cheech Marin.
The War with Grandpa is a fun movie. I laughed multiple times. It does try to get a little sentimental during the end but it kind of worked.