Divorce

My brother is married for 2 years now. We lost our parents quite early so he stays alone with his wife.now they also have daughter of 6 months his wife is herself a lawyer but we have never seen her go to court .her father was a lawyer too.now he is no more .she harrases my bother to thecextent of slapping him .keeps on abusing and threatening him that she will file all the possible cases and that she is being tourtured by him and me .i am a doctor by profession and stay away and hardly visit them once a year and was not ware of her behaviour till my brother finally broke down.sometimes we feel she has a physcological issues .she doesnt allow him to go out nor she allows any one in .and threathes him in all sorts.my brother is in merchant navy and is really depressed. He doesn't want to live with her anymore and wants to go to court for his defence and divorce .can he proceed .we know that she wud be slapping all the possible cases on us .we are ready to fight as we gave recordings of her abusing and all .is it right if we go to court first or do we need to work more before we proceed .we are ready to give her wathever she wants but i dont think she wud like the idea of mcd as he main motive would be pure harrasment .kndly guide