Sounds like you really need an attorney to help you with this. Most of what you want the court to consider should be put in a sworn declaration, filed with the clerk, and served on the opposing party or attorney. The rules on doing this are different in each county. If you don't do it right, the court can ignore your filing. It’s always best to consult with a good family law attorney to discuss the details before you act. See my AVVO Legal Guides on child support and court procedure for more information about the legal issues raised by your inquiry. Click on my photo. On my AVVO home page click on "View Contributions" or scroll down further and click on "Legal Guides." Scroll down the list of my 29 Legal Guides and select the topics relevant to your question. If you like my answer and Legal Guides, please make sure you mark them as “helpful.”
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I agree with the previous response. You should consult with an attorney. There are issues of modification based on current and future resources and there are issues of modification based on fraud to the court and DSHS for past support.
Peter J. Abbarno practices in the State of Washington; primarily in Thurston, Lewis, and Cowlitz counties. The response is limited to his understanding of law in the jurisdiction in which he practices and not to any other jurisdiction. No response to any posted inquiry shall constitute legal advice, nor the existence of an attorney/client relationship. www.centralialaw.com