ok i need some help here   my husband's friends come over with their almost 2 year old daughter. her and my 3 year old son play pretty well together, except that when she gets angry, she bites. she bit him 4 times in one after noon, and the mother didn't say anything until i started telling the little girl that it wasn't ok to bite.   i need someone's advice in what to do in this situation. is it…