You’ve not said what the family court issue is about, but it relates to support chances are she was entitled to get this information anyway. With that in mind, what harm, exactly, did you suffer as a result of this? Bear in mind that the courts won’t be keen to hear an argument that basically goes “I had to pay more support because I wasn't able to deceive the family court by hiding my real income and assets.” If you suffered no legally recognized loss, you have nothing for which to sue even if you could otherwise make out the case that agent had a duty to keep that information private.