Gang problem in Fitzroy

Caveman came home yesterday and told us about a new development at his school: the creation of a gang with his Grade 4 "homies".

Caveman: "Daddy, we started a gang at school!"
Me: "Oh, my. Who is in this gang?"
Caveman: "Me, Jack, Hayden, Conner and our leader is Brett." (Brett is about 4'1", 50 lbs soaking wet.)
Me: "Sounds good."
Caveman: "Since Brett is our leader, I decided we should use his nickname. We are the Bretty-Boo Crew."
Mrs Fastball: "Wow, you guys sure sound dangerous."