Wash. Super. Ct. Civ. R. 19

(a) Persons to be Joined if Feasible. A person who is subject to service of process and

whose joinder will not deprive the court of jurisdiction over the subject matter of the action shall

be joined as a party in the action if

(1) in the person’s absence complete relief cannot be accorded among those already parties,

or

(2) the person claims an interest relating to the subject of the action and is so situated that

the disposition of the action in the person’s absence may

(A) as a practical matter impair or impede the person’s ability to protect that interest or

(B) leave any of the persons already parties subject to a substantial risk of incurring double,

multiple, or otherwise inconsistent obligations by reason of the person’s claimed interest. If the

person has not been so joined, the court shall order that the person be made a party. If the person

should join as a plaintiff but refuses to do so, the person may be made a defendant, or, in a proper

case, an involuntary plaintiff. If the joined party objects to venue and the person’s joinder would

render the venue of the action improper, the joined party shall be dismissed from the action.

(b) Determination by Court Whenever Joinder Not Feasible. If a person joinable under

(1) or (2) of section (a) hereof cannot be made a party, the court shall determine whether in

equity and good conscience the action should proceed among the parties before it, or should be

dismissed, the absent person being thus regarded as indispensable. The factors to be considered

by the court include:

(1) to what extent a judgment rendered in the person’s absence might be prejudicial to the

person or those already parties;

(2) the extent to which, by protective provisions in the judgment, by the shaping of relief,

or other measures, the prejudice can be lessened or avoided;

(3) whether a judgment rendered in the person’s absence will be adequate;

(4) whether the plaintiff will have an adequate remedy if the action is dismissed for

nonjoinder.

(c) Pleading Reasons for Nonjoinder. A pleading asserting a claim for relief shall state

the names, if known to the pleader, of any persons joinable under (1) or (2) of section (a) hereof

who are not joined, and the reasons why they are not joined.

(d) Exception of Class Actions. This rule is subject to the provisions of rule 23.

(e) Spouse or Domestic Partner Must Join--Exceptions. [Reserved. See

RCW 4.08.030.]