Haram Earnings Of Parents
As far as i understood the question that grand father had purchased land in the name of sons and gave to them. He had land in his name also which could be smaller. On his death, his own land was distributed to daughters only and sons didn’t take anything from that land. If this is true then the sons didn’t get share larger than they deserved but rather got smaller. As the land given to sons during the life of father is not inheritance and daughters can’t have any claim on it. Only the land, which was in name of grandfather was the inheritance and should have been divided between sons and daughters as per Islamic law and could not be given to daughters only. Daughters can’t have any claim on the land given to sons during his (father’s) lifetime. If i am wrong then Faisal Haroon may correct it and point out the mistake. Grand son should not think that his father had larger share than deserved. He didn’t have any haram.