Estate Law Questions? Ask an Estate Lawyer.
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If you are requesting this information in your capacity as one of the creditor's of the estate and you have officially filed your claim and you are making a formal request for production of documents, then the Attorney must release the information to you. Otherwise, you need to file Motion with the Court to compel him to release the information to you. He cannot use confidentiality and attorney-client privilege to deny you the information being requested.
He can claim Attorney-client privilege regarding work product, discussions he had with his Client when he was preparing the estate planning documents.