If he is your legal father, you would have to be emancipated and that would require an attorney. As your father, assuming you are living with him, he has the right to use that monthly for food clothes housing etc. that money will end when you are 18 and since both your brother and you are collecting, it would appear that the money is based upon his disability, not yours. In which case, if you didn't live with him, there should be no check.
