Wife has illegal affairs

Dear Sir we live in Hyderabad. My mother's brother he is only son my grand parents has got married with sridevi on 26 Jan 2012 .Both belong to mahaboob Nagar district in telangana he is from ligampally village in nawabpet mandal and she is from rajapuram village which has railway station too.he is degree holder in medical and she has gone nursing but not completed her education Intermediate both are Major's. But after marriage in earlier days she behaved normal when she got know each every space of my uncle family how they get source of income what property has in detail she has a boy friend when she was studying they decided to marry.Her boy friend is her aunt's son.but she got married with my uncle. She is in relationship with her ex even got child now is four years old in this month got another child because her deeds we lost our maternal grandfather in last year August month my grand parent were old and when my got know affair her she taken help beaten very badly when my grandfather has severe health issue leg got injuried almost got cured even doctor you can take father within a 2-3 days a group of came to hospital beaten my uncle badly my grandfather watched this got tensed doctors discharged him from hospital he got know his son's wife having in sexual affairs my grandfather got miles heart attack he is expired and she is threatening my I will kill you in 5min with help of my boy friend because we live in hardly we visit the village no other to stop her .she has 3 brother they also started blackmailing and beaten to my uncle because them he diverted going in new route to work she so problematic every growing creating problems all the village seen this deeds warned do not to repeated this she said OK and she is doing the same .and she was cooking insects chapati to my grandmother for 2 week when my grandmother she asked my get flour mixture she find 75% of insects. It was not torable at all .she was critizing every day problem help us she not interested with my uncle and torturing him every day .we can't sit see it no more will request you badly helps us I think you know how village policing they just for work money we do not have that have money please please please help us