Mood Swing issue. To say abusive words.

Wife is very abusive and says wrong words sometimes. I observed her mood was getting off and it used to remain like that for 2-3 days and after which I had to made lot of efforts, say sorry so many times, then only she could return to normalcy. During this period, she will not talk or talk in angry way and will behave very angrily. Then she can say anything and becomes very angry and violent voice. She has mood swing issues. She does not like my parents and sister and does not want that they stay with us.Recently , one month back my son was born, then my parents and her parents came. She did not like them and wanted to send them out. Finally she could not succeed and forced me to drop her and son to her in-laws place and she does not want to come back now and says my mother & sister are doing black magic and I supported them .She is threatening for divorce now. Earlier she told me that during her childhood her father used to beat her mother and used to say abusive words.