I do not think that he can. Did you make sure to get his approval in writing? It sounds like you may have email confirmation which is likely good enough; particularly because you don't need permission (typically) for a move less than 50 miles. I would review your Final Judgment very carefully, if you have not already. You can't control what he does or what he files.
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He cannot successful have you held in contempt because he now moves in order to make the distance greater between the two households.
The statute looks at the location at the time of the entry of the Final Judgment.
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Eileen D. Jacobs, Esq.
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