John Stamos isn't your average grandparent, but that's exactly what he is on Grandfathered.

On the new Fox comedy, Stamos plays lifelong bachelor Jimmy Martino who learns that he has a son, Gerald (Josh Peck), and a granddaughter in about 10 seconds. Needless to say, he's not exactly prepared for these two new roles.

Check out the exclusive video below to seem him get some very important grandparenting advice.

Grandfathered premieres Tuesday, Sept. 29 at 8/7c on Fox.