Property

Hi, I am married and my father passed away in 2000. My grandfather had one building and one factory. According to my knowledge my father did not have any will. He looked after my grandfather's above mentioned properties. Apart from us sisters I have a borther who is married and all of us was married when my father passed away. My brother says my grandfather had a will which was made in the presence of one of his confidant back in the days when they were both alive now they are both dead. According to my brother my grandfather mentioned in the said will that all his properties mentioned above will goto my brother and us daughters should be given jewelley when we get married and dowrey. Mine was a love marriege, I eloped and got married so I did not receive jewelley or dowery. I was given one gold necklace and earrings when I did fasting for 8 days and that is the only jewellery given to me. My brother sold the residential building in 2005 and document shows the building was sold in approxmiately 10 Lakh rupees. Which is not the correct amount. When he took all of our signatures in 2005 to sell this property he gave us 1.25Lakh. I want to know how can I find out what was the real amount for which he sold the property and what is my right if I want to challange that now. Besides, how can I get my grandfather's will? which my brother claims was made? Also there is one factory still in my brother's possession and if I have any right on that? If yes then how can I go about claiming the same?