Yes. If several attorneys have the same scope of authority, each of them can act independently, unless the power of attorney says otherwise. You can require joint action: they then sign together, which gives more control but slows matters down. At a bank, what counts is what you set on the bank’s own form.
Each on their own or all together
Under the Polish Civil Code, several attorneys with the same scope each act on their own. If your daughter and son both hold a power of attorney for your matters with ZUS (the Polish Social Insurance Institution), either of them can file an application without the other.
Joint action has to be written down expressly, for example “the attorneys act jointly”. An act is then effective only with both signatures. This is good protection when selling a flat or withdrawing a large sum. For everyday matters it can get in the way. When one attorney travels or ends up in hospital, the other cannot get anything done.
Different scopes for different people
One person can hold a power of attorney for correspondence and official matters, another for managing a rented-out flat, and selling property can require both signatures. Each document describes its own scope, and the form depends on the act. Ordinary written form is enough for everyday matters; property requires a notary.
An attorney cannot hand the matter on to a third person on their own. They can appoint a further attorney only if the power of attorney itself, a statute, or the legal relationship it rests on allows it, for example a mandate contract. If you want one more person to be able to act, name them as another attorney from the start.
A bank has its own rules
Attorneys for a bank account are appointed at the bank, on its form. How many people you can name and whether they can act separately follows from the bank’s terms, not from a power of attorney written at home. One visit to a branch, or an instruction in online banking, settles it more reliably than the broadest document from a notary.
What happens to the powers later
You can revoke a power of attorney at any time, including towards just one of several people. It expires on your death, and so does a bank one. Both rules have narrow exceptions, which must follow from the content of the power of attorney and the agreement it rests on.
From the moment of death, the money in the account is governed by a death-benefit instruction (dyspozycja wkładem na wypadek śmierci) and inheritance law, not by the attorneys.
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