Torn and upset

My big brother moved to Mississppi to be with his girlfriend....she looks like a man, needless to say. She has called me emo (which I don't mind, but she was meaning to hurt me), she has called my mother "Dragon Lady From Hell" and that DID bother me. He has been gone for 8 months now, visiting only once. And now he has decided to come back for a visit at the end of the month, he wants to bring her. I said that if she tries anything on me or my family than I will punch her unconcious. I am torn between being a good sister and putting up with it, or being who I am and not taking her crap. Should I be Revengful me, or Innocent Sister me?
~Revengful Outcast