Harassment by Grandmother and Father's Sister.

Hi , I am an unmarried working professional(25 yrs) living with my parents in our grandfather's property. My grandfather passed away 30 years back. My father was a bachelor then. His other brothers live in Madhya Pradesh due to their jobs. My father has his own business in the vicinity of our(grandfather's) house. My grandmother is now around late 70's and her daughter(my father's sister) is of about 40 years of age. Our whole life both(grandma and bua) have tortured us , abused us and always created a disturbed environment is house. Sometimes even tried to physically harm us. But my father , out of love for his mom and sister never said anything and let us also tolerate both of them .My bua was also going through a divorce case and hence lived with us for about 20 yrs. They have always disturbed our peace of mind by continually abusing and saying harsh words and knitting family conspiracies. Now my bua(father's sister) had some settlement with his husband and went back to live with him. but she still comes to see her mother(that's okay) and says harsh words and creates chaos in our home , puts false allegations on us which disturbs us a lot. Even my grandmother joins her. And in my bua's absence too our grandmother harasses us. We take good care of her. Even when she got bedridden for a couple of days my mom cleaned her bathed and fed her and made her healthy to walk again. For years we have been tolerating both of them(grandma and bua). Our emotional well being is highly disturbed. My father doesn't want to leave this home because my grandma would be left alone and no other brother wants to take her with them. Now my bua also threatens us sometimes for using the senior citizen card(she wants to portray that we torture our daadi) to put my mom and dad in jail. please advise what should we do.