They have kids?

Noah: "Mom, how fast did you grow up?"
Me: "I guess you'd have to ask my Mom."
Noah: "Who's your Mom?"
Me: "Your Grandma in Carrington."
Noah: "The one who lives close to a park?"
...

Me: "Yes."
After much thought, he then asks, "Do you have a Dad?"
Me: "Yes. Grandpa. You know, he took you fishing."
Noah: "Oh. I didn't know they had kids."