Father in Law and Wife Torture, Confiscation of passport

Sir, we have been married for 4 years, and my wife used to fight with me often, but now her father in law ( Retired DSP of Police) threatens me of murder or arresting me of violence against women if I'm not listening to my wife. I have employed a maid for cooking, one for washing clothes and cleaning the house following her quarrel with me long back. Though my wife is a house-wife. 1 year back my father in law and brother in law came to my apartment and harassed me and finally I had to vacate the apartment out of shame. We got a baby 10 days back Now again they have started harrassing me. Father in law comes daily to our home after 10 pm and stays there till 12 pm - 1 am. I'm not able to sleep properly and my wife argues with me if I say them not to come. Yesterday I refused to open door and told them not to come. But they (Father in Law and Brother in law) entered my apartment and Beat me. I then called my parents and they came with police. After knowing that my father in law is a retired police, they failed to take any action and filed the case under family dispute. Police arranged for counselling but her father spoke with Commissioner and cancelled the appointment and made the inspector come to my home for counselling. ( This she threatened me that inspector will come and blame me for bringing police into family issue since her father has already made dealings with the inspector) I have installed CCTV camera in my entrance and they have tampered with it. They have confiscated my passport and threaten me that I'm doomed for life. My wife is still boasting that even police cannot do anything to her as well as her father and orders me to listen to her and her father. Kindly tell me the procedure to retrieve my passport