Property papers are in sister's hands

Hi, This is with regards to my father's property and house in Goa. My father passed away years ago and the acquired property and house is now owned and subject to shared by my mother, two married sisters and myself. Since my father's death, I have put money into building and renovating the house. However the property papers are still in my father's name and not changed to ours. My eldest sister (married but separated has been living here for the last 6 years) has taken the property papers now and refuses to hand them over to do the necessary changes claiming our father had given it to her. I'm currently working abroad so not sure what to do. Is there a way I can obtain a copy of the property papers if I know the survey number? Also can she legally change the property rights just to her alone, since she has the papers or is it illegal and can I file a case on her? I have invested a lot of money into the house but did not take any approval from her, my mother or other sister to make any changes, would this cause hindrance to me if I put the house and property for auction? Thanks.