We've been working on different relationships and the concept of the extended family.
I explained to Nathan that Grandad was Daddy's Daddy. And Nana was Daddy's Mommy.
He seemed interested, so I pushed on.
Me: "What will Daddy be when you're a Daddy, Nathan?"
This was followed by much laughing. He wasn't sure at first but then joined in.
Me: "Do you know why that's funny, Nathan?"
Nathan: "Because we're laughing."
Gotta love that point of view.