Brother and sister in law Haras

In my family, we having 1 elder brother and 2 younger sisters. my brother got married first and he is an alcoholic, he don't have children's. the 2younger sisters are not married yet. And we are surrounded with joint family near by house. He is creating many problems with abusive words, Threatening, bad words , curse , with my mom and dad and with relatives everyday, sometimes he will beat my father. He is asking the settlement and property. He is having same problem with her wife and wife family members, now she went to her mom house. Her wife is having our Jewels what we put on her marriage and she took the jewel's what they put for my brother . Her wife family also threatening speaking abusive words, curse to my family members. And she is spreading false statement about our family to our relatives via WhatsApp or call. its very In this situation what do : 1) My brother is asking my grandfather(mother side) properties and asking settlement to my father 2)My brother and her wife is not in same house, So she is having our jewelery Please suggest