Headache

Me: I have a headache
Ben: What hurts? Where you hurt?
Me: Right here on my head, I have a headache.
Ben: Oh no!
Me: I think I'll name my headache Ben.
Ben: I have a headache too!
Me: Really? What is your's named?
Ben: Little Sister.

I think he has this whole "having a little sister" thing alllllll figured out already!