Is it fair under Muslim law that grandchildren inherit nothing?

My father passed away under unnatural circumstances, he was murdered in 1997 while my grandfather was still alive. I was a newborn at the time, and we are Muslims. I did not inherit anything from my grandfather's property because I was told that if a son dies while the grandfather is alive, the son’s children receive nothing. I only inherited the property my father purchased with his own money. My uncles and their children inherited everything. Is this based on Muslim law? If it’s not part of Indian law, I would like to challenge it in court, as it feels unfair.