"Heirs" are those who inherit. "Assigns" are people who are "assigned" the rights--for example, someone who buys the rights from one of the owners.Whether only your father and aunt have rights, or whether the heirs of your deceased aunts & uncles have rights, depends on how the land was owned: if it was as joint tenants with right of survivorship, as each person died, his/her rights did NOT go to his/her heirs, but rather to the surviving co-owners. If owned as tenants in common, however, then as each person died, his/her heirs inherited his/her rights to or share of the property.If your father is still alive, then in any event, *you* do not have any rights to the property unless he specifically assigned (gifted or sold) his interest to you. You are (presumably) his heir (unless he has a will disinheriting you, which is legal), but being an heir is irrelevant until he passes away and you actually do inherit.