I need help dealing with my step mother please help!?

hi im 15 and i OWN my xbox 360 i buy all the equipment and all the accessories and games.. coupel days ago my stepbrothers figured out it was fun and are addictd to it now everytime THEY want to play it they whine to mommey and i get kiked off any ideas how to stop it im really thinking busting out of this treand please help!!