Conversation with a 3-year old

While trying to make Raeyen sleep one night, I had a little conversation with him.

Me: When gor-gor (Kieran) was 3 years old, I didn't have to make him sleep like I do to you now.
Raeyen: I am 3 years old, gor-gor is 6!
Me: Yes, you are 3 now. I'm talking about when your gor-gor was 3 years old some time ago.
Raeyen: No, I am 3, gor-gor is 6! Tomorrow I am 6!
Me: If you are 6 tomorrow, then gor-gor will be 9.
Raeyen: Huh? Why change number now?