Protection from Fake dowry case

Hi, I am 26 year Middle class family husband of a similar educated girl, I am a software engineer, I used to do job and then after 3 years i started business. My Inlaws gifted a car and some basic required things in marriage, My wife speak a lot of litter when she start and her parents support her in every mistake, he is a driver in Police, So My wife always speaks shit when somebody else use its car or someone even sit in that car, I asked his dad to take this car back because this car is the only root of all problems. Her dad, who is a driver in police warn me to do what her daughter says and he says, otherwise he will show me the doors to prison, also warn me to accused in fake criminal cases, I dont have issues with my wife but her mom and dad teach her bad things and fight starts in my home. I am not sure how should i handle this issue. I did not asked any dowry not before marriage and not after that, but they will ofcourse go to the police with same wordings, they have warned me already about it. i just want my wife not her car and anything else because its the only things that always let me put down in society and my family, I cant say no to anyone to sit in my car, its so embarrassing to me always, please advise me what should i do as a prevention and in case they filed fake case against me?