You'll need to ask him for the info that's attached to the account.
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If you are on your own account that has parental controls on it he will need to help you as he is the primary controllor.
but if you are using his account then that is against the terms and conditions as when I last read them they said not to share accounts or account information inthem.
and if thats the case then you need to make your own xbox live account and but a membership.