IF there is no will, then anything owned by a parent at death is distributed evenly among his children, under the rules for "intestate succession" (who gets what when there is no will). But that's only if there is no will. There is NO law saying that a person must will anything to his children or, if he chooses to do so, that he must treat them evenly. With a will, what is left to each child is completely up to your father: he can leave less to those who already received land as gifts.