Oregon Revised Statutes Probate Law § 112.047

(1) Property that would pass by intestate succession under ORS 112.045 from the estate of a decedent to a parent of the decedent shall pass and be vested as if the parent had predeceased the decedent if:

(2) For the purposes of subsection (1) of this section, the court may disregard incidental visitations, communications and contributions in determining whether a parent willfully deserted the decedent or neglected without just and sufficient cause to provide proper care and maintenance for the decedent.

(3) For the purposes of subsection (1) of this section, in determining whether the parent willfully deserted the decedent or neglected without just and sufficient cause to provide proper care and maintenance for the decedent, the court may consider whether a custodial parent or other custodian attempted, without good cause, to prevent or to impede contact between the decedent and the parent whose intestate share would be forfeited under this section.

(4) The intestate share of a parent of a decedent may be forfeited under this section only pursuant to an order of the court entered after the filing of a petition under ORS 112.049. A petition filed under ORS 113.035 may not request the forfeiture of the intestate share of a parent of a decedent under this section.