Upset that he has to share the room he loves with his grandfather, Peter decides to declare war in an attempt to get it back.


Tim Hill


Tom J. Astle (screenplay by), Matt Ember (screenplay by) | 1 more credit »
1,324 ( 289)
1 win. See more awards »





Cast overview, first billed only:
Robert De Niro ... Ed
Uma Thurman ... Sally
Rob Riggle ... Arthur
Oakes Fegley ... Peter
Laura Marano ... Mia
Cheech Marin ... Danny
Jane Seymour ... Diane
Christopher Walken ... Jerry
Juliocesar Chavez Juliocesar Chavez ... Billy
Isaac Kragten ... Steve
T.J. McGibbon ... Emma
Poppy Gagnon ... Jennifer
Lydia Styslinger ... Lisa
Joe Gelchion ... Chuck
Colin Ford ... Russell


Peter is thrilled that 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. With the help of his friends, Peter devises outrageous plans to make Grandpa surrender the room. But Grandpa is tougher than he looks. Rather than give in, Grandpa plans to get even.

Plot Summary | Add Synopsis


Old school vs. new cool. See more »


Comedy | Drama | Family

Motion Picture Rating (MPAA)

Rated PG for rude humor, language, and some thematic elements | See all certifications »

Parents Guide:

View content advisory »

Did You Know?


Released three years after filming took place. See more »


When Ed picks his grandson up from school, the boy is wearing a jacket. When they arrive at their destination, it cuts to the interior of the car and the boy isn't wearing a jacket. When the boy leaves the car he's wearing the jacket again. See more »


Billy: I think your grandpa may be a ninja.
See more »

Crazy Credits

After the first set of credits, some bloopers are shown, alternated with the cast dancing together. See more »


References The Godfather (1972) See more »


Good Morning
Performed by Max Frost
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User Reviews

Another Horrible Comedy by DeNiro
5 November 2020 | by Johnny_WestSee all my reviews

Robert DeNiro continues to churn out horrible performances in quickie comedy movies that copy other comedy movies, and here he is at his worst. The War with Grandpa is a comedy that has no comedy moments.

There is nothing funny about a kid who decides to get over on Grandpa by being at war with him. The humor is degrading and depressing, and there is no upside to any of this. No family values, no family love, nothing positive comes out of this movie. The message is sad and pathetic.

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USA | UK | Canada



Release Date:

9 October 2020 (USA) See more »

Also Known As:

Roomies See more »

Filming Locations:

Atlanta, Georgia, USA See more »


Box Office

Opening Weekend USA:

$3,623,880, 11 October 2020

Gross USA:


Cumulative Worldwide Gross:

See more on IMDbPro »

Company Credits

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Technical Specs


Sound Mix:

Dolby Digital



Aspect Ratio:

1.85 : 1
See full technical specs »

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