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Robert de Niro and Zac Efron get down and dirtier in this unrated version of the raunchy comedy about a wild road trip shared by an uptight guy and his foul-mouthed granddad. Jason Kelly attends his grandmother's funeral, where he reunites with his grandfather, Army veteran Dick, who is now widowed after 40 years of marriage. Dirty Grandpa is a 2016 American comedy film directed by Dan Mazer and written by John Philips. The film stars Robert De Niro, Zac Efron, Zoey Deutch and Aubrey Plaza.
