you asked if someone gives a power of attorney to two people in the same document, do both have to sign a deed on the principal’s behalf. the general rule is if a principal gives a poa to two or more people by a single document the authority is presumptively joint and can be exercised only by the unanimous action of the designated agents. thus, if a principal used one poa to appoint two agents with authority to convey his real estate, both would have to sign the deed and the other related legal documents in connection with the real estate transfer (3 am. when a principal designates two agents in the same document, the law presumes that he bargained for and desired the agents’ combined personal ability, experience, judgment, integrity, and other personal qualities.