Yeah, your cousin account.. Anyway if it's your first time that you are banned, you can be able to appeal once and play again, accounts are related to the same player, everyone is responsible of his own accounts. If "your cousin" hacks again under some of your accounts or same IP/PC as you. You and "your cousin" will be perma-banned no matter who hacked. And you won't be allowed to appeal your ban. So, be carefull next time, don't let "your cousin" touch your halo 2.