(1) Heirs on intestacy of the second degree are the parents of the deceased and their descendants.
(2) If the parents are alive at the time of the devolution of an inheritance, they inherit alone and in equal shares.
(3) If at the time of the devolution of an inheritance the father or the mother is no longer alive, the place of the deceased parent is taken by their descendants under the provisions governing succession by heirs of the first degree. If there are no descendants, the surviving parent inherits alone.
(4) In the cases under section 1756, the adopted child and the descendants of the natural parents or of the other parent of the child are not heirs of the second degree in relation to each other.