2015 ORS § 419B.803¹
(1) A juvenile court having subject matter jurisdiction has jurisdiction over:
(a) A party, who has been served in the matter as provided in ORS 419B.812 (Issuance of summons) to 419B.839 (Required and discretionary summons) to the extent that prosecution of the action is not inconsistent with the Constitution of this state and the Constitution of the United States;
(b) A child under 12 years of age who is the subject of a petition filed pursuant to ORS 419B.100 (Jurisdiction); and
(c) Any other party specified in ORS 419B.875 (Parties to proceedings) (1).