What are the property rights of sisters?

Sir, my sister married in 2009 with dowry of 20 lakhs and gold when my mother is alive, in 2015 my mother died due to health problems without providing legal person on his property. during that time my sister not taken any care of my parents. now my sister filled case for property share. my mother not proved me any type of financial support when she was alive. kindly give your feedback and how to proceed further