who are the legal heirs for a hereditary property?

ours is a joint family my husbands grandfathers property is being shared between his legal heirs. Grandfather has 6 sons and three daughters. where only two sons are alive and even they dont have children among the 6 sons only my father in law has 3 children (1daughter and 2 sons). Does the 3 daughters of grandfather come under legal heirs or do the children of these 3 daughters also come under legal heirs please advice.