Advise on finding absent owner of property?

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Hello, I am new to this and asking for advise on how to find the owner, or her relatives, of an abandoned house. I have reason to believe that the owner of record is deceased (not sure). Could someone advise me as to the best way to search for possible relatives who may have inherited the property? It has obviously been vacant for a few years and is very fixable. No one else seems interested, seems like a good opportunity. Thanks for any input....