False complaint in Women cell for Dowry, mental & sexual harrasment against Mother in law and family

Hi, We are two brothers but I with my wife are living separately from last 12 years since I am having job in different city. 2 Years back my brother got married to a girl. It was arranged marriage. My brother and his wife used to fight with my parents every other day for money and transferring the house which is on the name of my mother. It was happening for almost 11 months and then finally with all such pressure, my father left us (Only God knows where is he). But he issued a notice in paper before leaving that we dont have any relationship with my brother. Despite of all this, they fought with my mother and left to girl's native place (both of them). My brother's wife was pregnant and after 2-3 months, we got the call from Women cell asking us to visit. We went multiple times without a solution since they were demanding money. Finally after 4 months, since she complaint that I sexually abused her, my family suggested me to sign stating that we will pay them money after 6 months. It was plain white paper. After 6 months they again filed a complain in women cell with same charges (may be more). Now we are being forced to pay them money otherwise she is threating me to book against false charges of Sexual abuse, Sexual harrasment and targeting her modesty. This is absolutely false since I visited only twice to my native place when they were staying that too to meet my family. My Question is: 1. What is the value of the white paper which we signed in women cell to pay money 2. What can happen as she has filed complain against us (my brother is still living with them) 3. What can happen to me for false charges of Sexual abuse, Sexual harrasment and targeting her modesty. Can police arrest without investigating. Please advice as we are having so much mental pressure