This should not be your responsibility. However, if your dad objects to the move, your mom will need to get a lawyer involved to file a petition to modify. You are definitely old enough to voice a preference to the judge. If the judge agrees the move would be in your best interest, then he will allow the move. If your dad lays hands on you, call CPS and the police.
I am not intending this to be legal advice, because I don't know the particulars of your situation. Call me if you would like to discuss this or other isues.
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