Almost certainly not (immunity) but worth seeing a local family law attorney to discuss your options.
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You may not receive any compensation but depending on what your "court papers" said it might be worth going to an attorney. Depending on your court papers your ex might have violated a law concerning parental kidnapping. I do not think that an attorney would take this case on a contingent fee but it might be worth it for you to go and speak with an attorney.
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