What to do when threatened to be lodged in dowry act by wife and in laws?

I was married on 22 Apr 2016. i am a defense personnel. My wife was pursuing b tech from her parents home and was in third year at that time. My family supported her in completing b tech. through out her last year of B-Tech she was residing at her parents house and financial support was provided by us. After completion of her B-Tech exams in month of Jun 2017, When i told her to come back to my house, she started making excuses and stayed there till Sep 2017. At my home, she started misbehaving with my parents on guidance of her mother( i have voice call records of conversation between her and her mother that too recorded by my wife). In month of Oct 2017, I visited home on leave and I came across all the recordings taped by my wife unintentionally and then I called my Father-in-Law to discuss her misdeeds. Opposite to my expectations, he arrived with her wife on late night of 22 Oct 2016, accompanied with some goons and started yelling on us and told her daughter to come along them and when she refused to go with them. My Father-in-Law falsely reported to local police station that my mother is harassing her daughter for dowry and I have been beating her for last one and half year in influence of liquor, whereas, she was not living with me and I was serving at border areas. On the very next day, Police personnel arrived at our doorstep and enquired about the same from my mother and wife. I was not available at my home at that point of time. Police SI found both the charges false on his preliminary investigation and counselled both my mother and my wife. I brought my wife to my place of work after this. Here she is in regular contact with her parents and always quarrel with me. meantime she is eight and half months pregnant. Her brother threatens me on phone to book my family on false charges. please help me save my life and live with peace.