Send a letter. If you can find their names on tax records you can find her address. Or just keep coming back to the neighbors home till they get fed up with you and give you the woman's number.
And if you really are able to solve a problem for the seller then you can ask the neighbor for her number on that premise. She wont be protecting the seller, she will be hindering the seller from having a problem solved. A problem you might be able to solve.
Pull the death certificate and see if she filled it out. If so, her forwarding address will be displayed.
You have his name from the property so see if probate has already been filed. If so, the administration process has already started and the PR has been approved by the probate court.
See also if a will has been lodged with the court. If so, the court approved PR will be your point of contact..
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