(1) For all purposes of intestate succession, full effect shall be given to all relationships as described in ORS 109.060, except as otherwise provided by law in case of adoption.
(2) For all purposes of intestate succession and for those purposes only, before the relationship of parent and child and other relationships dependent upon the establishment of parentage shall be given effect under subsection (1) of this section:
(a) The parentage of the child shall have been established under ORS 109.065 during the lifetime of the child; or
(b) The parent must have acknowledged being the parent of the child in writing, signed by the parent during the lifetime of the child.