NO -- you file the motion for contempt in Snohomish county --that is where the file is located. To try to change venue merely complicates matters and since each county has different local rules, that would not be a good idea.
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In addition, getting the other party to actually show up and argue is easier if it is in their county of residence. Absent some extenuating circumstances, family law is best served by traveling to where the action is.
The best situation is to bring the matter in Snohomish County since the parenting plan is in Snohomish and her contempt would be with their order. As long as one parent lives in Snohomish, they'll retain jurisdiction. Also, it will make any excuse by mom about not being able to show to the show cause hearing weaker than if the court was in King.
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