Harrassment by my husband and mother in law

Mine is a second marriage and I got married to a government official.My mother in law is a widow and a pension holder.My husband has two elder sisters.she is 73 years old but to my fate she is with us since day 3 of my marriage.Taking the advantage of my husband's love and concern she always demanding and ensures to keep disputes between us.Its just an year and a month passed in my marriage, every alternative day we pick up a fight because of her possessiveness.Im not the person who cuts the relationship between her and son but her possessiveness and ever complaining nature is actually disturbing my married life.We both went for a marriage counselor but it is not helping out.She never leaving us atleast a day and my husband not sending her for few days to her sisters place for few days and he is not taking me anywhere atleast for day or two stating that his mother would be alone.we have 3 servants to help her.We are now in verge of getting seperated. Stating my problem above,my question is 1.Y the daughters are not taking the responsibility 2.where to approach for this problem and which kind of centers can help in councelling the mother in law 3.Recent developments in protection of elderly persons by supreme court never mentioned about possieve parents and ruing their own children lives Having said this, please help me in protecting my life from this typical son and mother relationship.Im so depressed.please help I am loosing myself. Thank you