There's no black and white rule on this, the legal standard is a material or substantial change in circumstances. Issues you’ve raised are important but a resolution requires specific review of all of the facts and circumstances, such that it is nearly impossible, if not entirely impossible, for an attorney to give you a useful legal analysis based solely on a summary posting on an internet site. I appreciate your concern. I know this is not the answer that you are looking for, but I believe that you will need to obtain a consultation with an attorney to further explore the specific circumstances behind your question.
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