Sister in law torturing us

Hello Sir, The incident date is 23.05.2019(Before that also so many times it happened),Sister in law started scolding on me when my mother and brother gone out after dinner, once my brother came home I have informed him what my sister in law did. So again she started shouting on me saying like your creating a fight between husband and wife and she started shouting in high voice by that time my mother also came and she said I will fall on your feet please don’t shout and she fell also after that sister in law said why you will fall, I will fall on your feet then she twisted my mother foot and we got scared in that tension my brother gave one slap to her, immediately she started beating my brother, so me and mother were trying them to separate to stop beating each other by that time our home owner came and watching in the window, when my sister in law observed that she started saying see everyone are beating me. Then she went out from home and she started shouting and she was using non sense words all of us and our owner also telling we know this family from more than 40 years don’t blame them go inside the home and will discuss tomorrow but she didn’t stopped and she said now I will take my son and I will die, so we got scare and we called her brother, later he came with wife and took her to their home. And her ticked was booked by her brother for her younger sister marriage, so for marriage she went native, now her parents telling if you want your wife and son come and take or else let her be here only, we know what we should do to your family. Sir she wanted to go separate but we are having only brother and he dont want to go separate more over my father left side body is not working, we are not getting if she gave false complaint on us.. While going out of home she warned like all you should come road ans stand like that i will do. and my brother having only one son we need him and please note for both of them it is second mrg. Please help us