Wash. R. App. P. 3.4
The title of a case in the appellate court is the same as in the trial court except that the party seeking review by appeal is called an "appellant," the party seeking review by discretionary review is called a "petitioner," and an adverse party on review is called a "respondent."
Upon motion of a party or on the court's own motion, and after notice to the parties, the Supreme Court or the Court of Appeals may change the title of a case by order in said case. In a juvenile offender case, the parties shall caption the case using the juvenile's initials. The parties shall refer to the juvenile by his or her initials throughout all briefing and pleadings filed in the appellate court, and shall refer to any related individuals in such a way as to not disclose the juvenile's identity. However, the trial court record need not be redacted to eliminate references to the juvenile's identity.
Wash. R. App. P. RAP 3.4