Registered Will Against Registration

Hello, I am Lakshmi (55 years), from Andhra Pradesh. I am in big trouble as registration happened against the "registered will" given by my mother to her daughters (us). We are four children (2 males (deceased) and 2 females) to my mother. My mother got the said property from her mother as gift deed and it was registered in 1977. In the document it states that the property is given to her daughter (my mother) and after my mother it would be transferred to her 2 son's. But my mother registered her part of share to us and registered a will stating the whole and sole of her property should given to her daughters after her demise. Recently(40 days back) my son in laws (my 2 brother sons) has sold the property and registered to someone without approaching us. Now my question is, can I get any help from the registered will against the registration happened? I have threat from my son in laws and they haven't approached me or my sister before selling the property. Do I have any right to the share I own as it is already registered to someone? Please help me out. Its my moms gift and i do not want someone to theft away.