They dun give two shits, he's immature, and just starts whining and crying and he gets his way, I'm just gonna see what happens come Christmas, i'll pick up the argument again then, maybe they'll look at it differently.
I still think my solution would work, it solves most of your problems and your parents (assuming they don't know anything about XBL) will never be the wiser. In fact, you might even luck out and when your whiny brother tells your folks that the silver-account-that-has-the-old-name-of-your-account-but-is-actually-brand-new has run out of Gold membership (because it never had it to begin with) they might buy that new account some Gold time, thus effectively creating two Gold accounts on your xbox at very little cost to you.
Does your Xbox have a component cable? If it does, change the switch to the opposite of whatever it is normally and it usually doesn't display on the TV. Your brother will then think the Xbox is broken, get pissed off and whine to your parents to get him a new one. When he loses interest in your Xbox, take it back and say you "fixed it". Now you have two Xbox's, with no cost to you, and you don't have to put up with your little brothers ****. Either that, or just beat the living piss out of him and, if he says he'll tell your parents, threaten him with more beatings. Tell him you'll let him play it for an hour a day if he doesn't tell, but if he does you'll issue more beatings. Remember, a phone book hurts and doesn't leave (noticeable) bruises . This is a more cost-effective method, but probably not good in the long run. Matter of fact, you probably shouldn't listen to me at all.
I seriously lol'ed. A rolled up newspaper, when applied effectively, really hurts. Or, if you have a memory foam pillow, freeze it (they become hard as bricks) then have a 'friendly pillow fight'. Whining to your parents that you hit him with a pillow can't get you in that much trouble.