My grand father (mothers father) had property of 30 acres agricultural land, My father changed his s

My grand father (mothers father) had property of 30 acres agricultural land, My father changed his surname to my mother's surname and acted as son to this family. My father took a loan on that 20 acres land, but he couldn't repay it. Bank has sold our property in auction. I was a child and I didn't sign on any documents. Do i have right on this land now?