Family Issue

We are two brothers and two sisters. I am elder among all. We both brothers are married. Sisters are also married. Mom, Dad both are there. I do job in Kolkata. My mom and two sisters always uses bad words and do mental harassment on me and my wife. Because of this me and my wife are losing our mental peace. My father never tried to control my mom and sisters. Even sisters husbands also not able to control them. All the neighbors are aware about that. Now they are doing same thing to my younger brother and his wife also (he recently married) Please suggest me how can I get help from law and order. I am ready to personal consultation also. Please help.