So long as you are living out of state with your father there really is no reason for you to seek "emancipation per se" from your abusive mother. The best way to feel secure about the situation that you are wriitng about is for your father to file a petition in the court that has jurisdiction over the custodial issue of you and your sister seeking full physical custody of you both. For that, he should consult with a family law attorney to assist.Emancipation is a legal term where a minor seeks a court order declaring that he or she is a deemed an adult with all the responsibilities of an adult even though he or she is a minor.This does not seem to be what you want. It appears that you do not want your mother to have custody of you and your sister.