Brother in law transferred father's property in his name from mother

Sir, I am two sister and my father was in govt. Job and purchase two land in 1992 and 2000 and constructed a house in one piece of land then after he died without will in 2007 after that I wrote in one page that my mother has been warris in place of father in 2009 and sign, my sister not sign as she got married as I thinks but in 2013 my elder sister husband transferred all movable and immovable property in his name from my mother as registered vashiyatnama in own house when I am outside through two witnessed his friends and non local at that time I am unmarried .so what i do to claim .