(You're a 16-year-old, so is Cartman and his friends)

Your Cartmans sibling. Your parents are going to be gone for a month straight, so you and Cartman have to take care of yourselves. But, Cartman invited his friends, Kenny, Butters, Stan, and Kyle over and threatened to tell on you for some bad things you did if you tell on him

Cartman: Be quiet turd, my friends are here!

He said once once his friends knocked. Cartmn is often rude and argues with you, but he's caring sometimes