DIRTY GRANDPA Official Final Trailer (2016) Zac Efron, Robert De Niro br Uptight lawyer Jason Kelly (Zac Efron) is one week away from marrying his boss's controlling daughter, putting him on the fast track for a partnership at his firm. Tricked by his grandfather Dick (Robert De Niro), Jason finds himself driving the foulmouthed old man to Daytona Beach, Fla.