Women property right

My great grandfather's property is divided among his 4 sons. My grand father got his share from that property. My Grand father has 3 daughters and 1 son (My uncle). My mother who is daughter of my grand father and died in 1984 at my 6 years. My grand father died in 1997 with out writing any testimony. After my mother's death, me and my sister don't have any contact with my maternal uncle. My maternal Uncle is acting as guardian and announced as a property owner and he converted some of the portion to his sons name. After my mother passed away, he gifted some portion of land to my both mothers's sisters (2) so that they can't claim on that property and he ignored me and my sister and didn't informed us about the same. Will it be possible to us to claim on this property and ask for a share. In case if my uncle reject to identify us as legal heirs, do we need to prove that we are legal heirs? ( As we both are kids when mother's died, we don't have the exact dates of my mother's death). How can we prove that we are legal heirs? Please let me know if you need more details. Thanks,