Suggest Treatment For Abnormal Activity With Lot Of Anger

Dear Sir, My wife is very arogant, Becomes angry every times and when she is angry she can do anything, she can pluk her hairs, beat me, my daughter, beat the mate servant, tells slangs, beat her mother even tries to suiside also... But when she is good (which is a rare situation) or if somebody outsider meets her cant understand anything.. she is a housewife , not much educated, she have a brother who is a brilliant student. Her parents always campares her with her brother and made her feel bad about that. After we got married, mu mother also reacted badly with her and didnt try to fulfill the place of her mother. we are basically from West Bengal but stay at bangalore..I took her once to the mental doctor, but there she acted like she is very normal as I tols you earlier. Doctor have asked for family therapy. What happens in this family therapy? Is this curable? How can I get my wife back and lead a good life??? I want to visit you also if required...Please help me....