I think I'm going to delete my cousin's bully's GTA Online account.
Why do you  want to delete their account?
Because he's always so mean to my cousin.
People can be annoying sometimes but it is not good to delete somebody's account. It might be illegal and you could get in trouble.
I'm only going to delete his account. I don't think that a bully like him should be playing online.
I understand how you feel, but it isn't your place to keep him from playing online games. If he does something wrong, then the game company will take care of it. I think you should just leave the entire thing alone.