The POA gives the son the ability to take certain financial and legal actions on behalf of his father. It does not make him a licensed attorney and it does not entitle him to claim attorney-client privilege whether the elder is alive or not.
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Not only does the status of being an agent (attorney-in-fact) NOT entitle the son to claim any attorney-client privilige, but the son is obligated to act only in the best interests of his father. That would include providing truthful information about his financial transactions under the POA, at the request of his father or his father's guardian or attorney that would help his father. If the father is now no longer mentally competent, I believe his guaridan can revoke the power of attorney. The errant son can also be prosecuted under Maryland's criminal code for financial elder abuse.
Only a licensed attorney can claim that privilege. After the principal on the POA dies the agent has no authority to act on his or her behalf. Rather, the executor steps in and takes over the financial affairs of the decedent.
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Your question is lacking in some key details, which has lead to a real varied group of answers.
If you are saying that son, in his capacity as the elder's agent, consulted with an attorney in the conduct of elder's affairs. Then he has his own privilege to claim. His assertion would simply bar the lawyer from speaking of the consultation. The son is always free to speak, on his own, and he can be compelled to speak on anything except what he discussed with his or the elder's attorney.
If your question is whether the power-of-attorney gave the son some elevated status as an "attorney" so that communications between him and elder can be kept confidential, then "no." What son and elder discuss among themselves is subject to inquiry and full disclosure. The instrument allows him to act for elder, it does not give him the status of a licensed lawyer that would give elder legal advice.