The View from the Swing (2000)

Ted, a young father (Todd Andrew Bryant), is on pins and needles as he counts down the days before the birth of his first child. Unsure of how to deal with the situation, the soon-to-be-dad suddenly realizes that the only person who can truly prepare him for a child version of himself is very own dad (Tim Conway). It's comic mayhem galore as granddad tries to school his own son in the art of staying young forever. Co-stars Jennifer Grant.