I want a clarification for this torture from my sister in law..?

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My sister in law(brothers wife) is not from a nice family. basically they main job is politics.without a clear idea we made this before 6 years..from that time my sister in law threat my brother like anything..within 10 days after marriage she wrote a letter like brother asked a car as dowry ..then she threats everyone she will die..like tat ..the same torture happed to another family who married my sister in laws sister..after 3 years that family divorced..so now my sister in law wants to stay that sister also in my brothers home..my brother not allow it..so now my sister in law tells to everyone she will die..before that will write a letter ..in that she will mention my name(his hubby sister) and my mom name..how can i face this problem??my brother loves her very much..at the same time he cant tolerate his tortures..they are having a baby..so we all think about it..but her mom only think her family..in her family first is a boy,after two female ..boy does not working...her father is a drinker..and also these ladies wont respect him.. everything decided by ladies ..i want a solution in any way..like family way or police court like that..and also she telling she will complaint about me and my mom in the police...i can say ..i didn't do any wrong in their life...now she havin some chat history with my brother..in that my brother was tellin ..his mother in law and sister in law came to his home and torturin him(all time tv in full sound,noone carin about his baby,no happyness in home for him,there is no food for him) like tat..for that i replied opposite to his sister in law ...even though i didnt tell anything wrong about my sister in law..so now she shoin this as a proof..i can tell nothin wron in that..i want a solution for this...please help me ..im pregnant now..she only make me to feel bad..