How to protect oneself from false domestic violence case

Hello experts My wife along with my two children left her marital home within a month after assaulting my mother.... Earlier also she had bouts of physically assaulting me and my children.. Despite my best efforts in bringing her back she has not come back.... Now her brother has threatened me to break my legs if I enter my premises..... And has also said that without giving money I can't call my wife and children..... Further without court order he will not allow me to talk to my wife and children..... Also she had threatened to file a DV case.... Despite no fault on our part...... Being a law abiding citizen I still am exercising restraint and am waiting patiently since last 4 months for my family to come..... I have been sending money on monthly basis but they say it is not enough..... I said that till November I am not in a position to give 12000 rs on a monthly basis.... I am right now giving 6000 on a monthly basis....the most absurd moment was when my brother in law in one of his phone talk asked me to scientifically prove my fatherhood to my second child .kindly suggest remedial measures......