(1) Heirs on intestacy of the fourth degree are the great-grandparents of the deceased and their descendants.
(2) If great-grandparents are alive at the time of the devolution of an inheritance, they inherit alone; more than one inherit in equal shares, irrespective of whether they belong to the same line or different lines.
(3) If great-grandparents are no longer alive at the time of the devolution of an inheritance, the one of their descendants who is most closely related to the deceased by degree inherits; more than one equally closely related descendant inherit in equal shares.