In Laws asking for money

Im a working woman in a location different to my in laws. My mother in law used to verbally abuse me and my family. Since it was not possible for me to leave my good paying job my husband suported me and joined me here. Once they had come to our place for my mother in laws surgery. My mother in law started abusing my father and me and as to why they married their son to me. I had never uttered a word to them but i stood for my father and told them not to talk anythng about my parents. Now they have gone back to their homeand we had not spoken with them for 2 years.My husband supported me and we have bought our own house never demanded any money from our parent in laws and were living happily. Now they cannot bear that we are happy and they arr threating to file a case against us to pay all the money they had spent on raising their son my husband, spent money on our marraige, they had given him a bike and asking money for that.also they had kept their FD on bank as collateral for a loan which was in my husbands name. My husbands business failed then and he was not able to pay. Also they had paid the down payment on their own 3 years back for the property we are currently living in. They took away all the jwellery they had given me on my wedding day. I had given them lots of exclusive gifts which i brought from USA which i never asked back. my parent in law have started calling evry person we know even my parents and asking for money to be returned threating to file a case. My in laws have been very strict to my husband and his sisters when they were young.physical and mental torture was daily routine.his mother wouldnt give them food for days beat them up regularly.but my husband always wanted us to stay together but because of his mothera nature we cant live with them. My in laws have lots of money enough to buy 10 luxury flats. But they are still harrasing us for money whichever they have spent out of their own free will. Does my in laws have any ground to file a case? Can we file a case for mental torture. We dont want a single penny from them and want to stay away from them.