ORS 108.045: Liability of stepparent for expenses of family and education of children.

(1) The expenses of the family and the education of the minor children, including stepchildren, are chargeable upon the property of both spouses in a marriage who are parents or stepparents of the minor children, or either of them. However, with regard to stepchildren, the obligation shall cease upon entry of a judgment of dissolution.

      (2) As used in this section, “stepchild” means a child under the age of 18, or a child attending school as defined in ORS 107.108 who is in the custody of one biological or adoptive parent who is married to and not legally separated from a person other than the second biological or adoptive parent of such child.

      (3) Notwithstanding subsection (1) of this section, the legal duty of a parent to provide support for a child, as otherwise required by law, shall not be affected.