He is my mom's boyfriend's son. He's about a year older than my daughter. Which means that if my mom and the boyfriend were to ever marry, you shouldn't even begin to attempt to diagram this family tree.
The little boy and my girl get along typically of kids this age. They play nicely. Then they fight. And tattle. Then they play nicely and fight some more.
I'm thinking of buying earplugs for everyone in the house over the age of 10.