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To be honest you would need a private investigator to get this resolved. I would also urge that you use online methods such as Facebook, Google, and other search engines to hopefully be able to find him. Then, and only then you would likely need an attorney because you would then need to figure out where to file for custody--if the parent, for example, has been at one location long enough, perhaps that state's law is now in charge of custody rather than where you are located. So first you need to find him, then you can figure out on how to serve him and pursue him directly.