Your brother had a fiduciary duty to you while he was acting as your agent under your power of attorney. If he misused the power of attorney, he could be liable to you. You should consult a lawyer experienced in litigation regarding this serious matter. You may also be able to ask the attorney general's office for help if Maryland's laws permit the attorney general to do so.
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My comments are not intended to establish an attorney-client relationship, are not confidential, and are not intended to constitute legal advice. Proper legal advice can only be given by an attorney who agrees to represent you, who reviews the facts of your specific case, who does not have a conflict of interest preventing the representation, and who is licensed as an attorney in the state where the law applies.
Yes -- you can sue him civilly. There is a brand new statuate in Maryland ("Lorretta's Law") that specifically allows you to hold your agent (brother) accountable for his mis-use of your funds. You may also contact your local State's Attorney Office (the elder law division) to ask to have this prosecuted as a crime under the Maryland criminal code, and to have him ordred to make restitution to you. You will want to hire an attorney if you choose the the civil suit route.