My elder sister woefully transferred all Ancestral property from my

I am the youngest daughter 60yr old, my mother 87 yr old was the owner of ancestral properties(after dad's death)& transferred everything to my elder sister. My elder sister cheated me & mother in registry office, she said she is transferring only her share. But she legally transferred entire property without our knowledge, as we were not provided papers to read properly. My elder sister always said me "I will give your share, I transferred fully because you don't have husband to take care of property". I am a widow with 2 daughters. From 2018 I am fighting with elder sister's family to get my share. Elder sister is planning to sell entire assets & give it to her sons. Everyone in this village know how much my late husband spent for this family. Since my mother was going to give me more share, my elder sister transferred fully. She never took care of mother in past 35 years. Mother got paralyzed when she knew we got cheated. I have videos of mother saying the share she will give me. Pls help get my share