Harassment by father in- law and mother in-law

I am 29 years old and my baby is 1.5 years old. After birth of my baby my in-laws came and live with us at my home. Mother in law was employee of state government and gets good pension and father in law was in military and also getting good pension.After our child birth my husband stared business in local area and I he takes money from his parents. After some days both my in-laws stared quarreling with us for unwanted reasons. They used to fight with maids also. My father in law is alcoholic person and used fight after every 15 days because of small reasons and always it ends with money issues which my husband took from them.This quarreling increases day by day and we fill very harassed on that days.Beside all these My mother and father are care taker of my child and my in laws are not taking care of her. After all issues we stared living separately and now they are doing black mail to us because of money and every time says we will file complaints about you. I need to know what actually law said and is it possible that they will file accompanists about us and under which act and what action we should take.