Mother and Daughter family issues

We are twin daughters to my mother, my father passed away few years ago, my younger sister stays close by to my mom i stay in kharagpur with my husband. My father had made a will (more like a gift deed) in which he granted his current residence to my younger sister completely without mentioning anywhere in the will that he has 2 daughters or even the fact im not receiving anything. Now my mother is planning to sell the other ancestral property in which they are again planning to not give me anything. she doesnt acknowledge me either as her child, she keeps mentally harassing me by spreading rumours about me and bad mouthing my husband and daughter, i have stopped taking her calls as its too regressive. Still she goes ahead and starts calling up other relatives asking for money every month. I want to know what legal action i can take to stop all this and also is it necessary for me to pay monthly for her when she doesn't acknowledge our relationship in decent manner