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Thanks for your question! I am working on your answer. This service is for information only. I cannot give you legal advice. Please stand by!
I appreciate your predicament. However, the information I have given is the only information I know to give. Your ex husband's ex wife was able to place a lien on his property for a child support debt because the debt had likely been reduced to a judgment probably due to his failure to pay. Not knowing the details of that situation I can't say more than that.
Unless he fails to pay you currently while he is alive and a Judge offers you a judgment, you cannot do anything other than try to stay informed of his passing. You may get another answer if you seek out the services of an attorney and have a consultation in person, however I do not think so. There is no estate to put a lien on until he passes and you can't get a lien until he (while alive) or his estate fails to pay you as ordered by the court.