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The answer is - this is a gray area. No statutory law states what happens in this situation in WA. The divorce decree normally takes care of such nuances, but the divorce decree likely does not mention what is to happen to the check, because this was not anticipated.
As such, one of you has to file a motion for clarification with the Court, asking the Judge to make a decision as to how the divorce decree applies to the check. After a quick hearing, the Court will render a quick supplementary order that states who the money goes to, or how it is split.
Unless of course the parties agree, in which case an agreement in writing should do.
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