The Old Grandpa

Thomas was watching me shave the other day, and declared "When I'm a daddy, I'm going to shave my whiskers!"

He thought for a moment, and said "What will you do when I'm a daddy?"

I said "I'll do grandpa things, because when you become a daddy, that will make me a grandpa."

After another thoughtful pause, he asked "What will we do with the old grandpa?"