Harassment by wife and her parents including her sister

Hi! I've been married for around 10 years, and right from the very beginning my wife, her parents and her unmarried sister tried to torture me and my parents by several ways. This is an arranged marriage and they are blaming us for asking for dowry ,a laptop, which we didn't ask, rather they gave us on their own, purchasing in the name of my wife. Later throughout these years my wife never did any household jobs, nor looked after my son's daily chores.. Those were taken care of entirely by me and my parents. She only rested and i took her to many ,nearly 15 different doctors at different times through these years to treat for her mental irritation and nervous problems. She is too much violent in her actions, abusive in her language and always tortured my family mentally and also many times slapped and beaten me during quarrels. All are being planned by her parents as they initially wanted me to support them financially coz their two sons left them after their marriages and don't extend any financial help. My wife threatened me several times of going to police stations and filling 498A, against us if i do not abide by her and so to settle separately in any rented house. Her parents would have been able to pull money regularly from me, if my father is not with me. She herself amputed her wrist veins twice in seer madness, only due to heated arguments with me, as i was not willing to support her for going for a B.Ed degree, as i was not able to support it financially. In this context, she approached our local ps and complaint against us, which according to the police is not officially registered yet, but the OC of ps shall sit with us for an amicable settlement. She also presented some documents, which shows that i have handwritten a daily household job routine for her, my mother and for my then unmarried sister. I am not sure of writing any such documents. They are telling that this document is written by me some 8 or 9 years back and shall take me behind bars, for writing such routine. Please suggest on this. I fear if she can come home by virtue of this, then she will be more aggressive and could even harm us physically. I don't know what exactly they want, but one of their intentions is to harass me and my family so that In future we cannot protest any of their inhuman actions and tortures done on us, which they are doing for the last 10 years. Please suggest my immediate course of action. I am open for any queries from your end. Thanks...