The divide in family members when you get chavs in the family are hilarious, the conflicts start and the ridiculing. Its a great phase you should try and capture, to wind him up years down the line.
Oh and skaadi, is that sig 4 lines...i think not, your breaking my scroll wheel damnit.
Start referring to him as chav, like in normal conversation.
"hey, chav, help me find the remote."
"yeah, that chav over there is my brother."
"I hate you, you're adopted, and the world's gonna end soon. Chav."
stuff like that.