Brother in law cheated us with money,marriage jewellery, absconding

Hi,nMy husband's brother cheated us with around 50 lakhs and my jewellery which I got at my marriage, he used to extort big chunks of money by emotionally blackmailing my husband since beginning, after our marriage he asked my husband to force me to give all my jwellrry and money to him in the pretext of putting it in his locker.After 5 months he stopped talking to us, not responding to calls or meet at his home.It's been 5 yrs now and we're actively pursuing it so he is threatening us by various means and now my father in law who is taking his side tells us that brother in law has taken loan against the locker as he is in financial crunch so please leave it.Father in law is playing emotional card, brother in law is threatening us.. nWhat should I do now, we are working in Bangalore and they know that we wont be able to come to hometown again and again to pursue this, please help.. We have all the remittance proof of money which my husband use to send him from UKn#Hindu