Sons, Suns, and Sunshines

Ace: Mom, are you married to Ben?
Me: No, I'm married to Daddy. Ben is my son.
Ace: And I am your sunshine!
Ben: I am not the sun!
Me (to Ace): Yes, you are my sunshine.
Me (to Ben): Ben, you are my son. Because I am your mom.
Ben (looking at me like I'm crazy): I am not the sun, Mommy.