Real Estate Law
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If the money was a gift, and there is no agreement that you would pay the money back, no.
In order to put a lien on your property, the person would have to sue you for the money and obtain a judgment. If a judgment were received, a lien could be placed on the property. However, it is unlikely that the person would get a judgment against you for the money if it was a gift. If the person has no contract or other agreement showing that you were to pay the money back, they're probably up the creek!