No, a family member cannot override a power of attorney once it is signed and valid

A power of attorney is a legal document that gives one person (the agent) the authority to act on behalf of another person (the principal). Once the principal signs it and it meets your state's requirements, family members have no power to cancel it, ignore it, or prevent the agent from using it — even if they disagree with the principal's choice.

The only person who can revoke a power of attorney is the principal themselves, and only if they still have the mental capacity to do so. A family member who wants to stop an agent from acting must go to court and prove the document is invalid or that the agent is misusing their authority. This is a formal legal process, not something a family member can do unilaterally.

Key Takeaways

  • Only the principal can revoke a power of attorney during their lifetime if they have mental capacity; family members cannot cancel it on their own.
  • A family member can challenge a power of attorney in court by claiming it was signed under duress, the principal lacked capacity, or the document does not meet state law requirements.
  • If an agent is misusing their authority, a family member can report the abuse to the court, the state attorney general, or adult protective services.
  • Once the principal dies, the power of attorney becomes void and the agent's authority ends when ready.

When a family member can challenge a power of attorney in court

A family member can file a lawsuit to invalidate a power of attorney, but only on specific legal grounds. The most common are that the principal was coerced or pressured into signing, that the principal did not have the mental capacity to understand what they were signing, or that the document does not follow your state's legal requirements (for example, missing notarization or witness signatures).

The burden of proof falls on the family member bringing the challenge. They must present evidence — medical records, testimony from people who knew the principal, or documentation of the coercion — to convince a judge that the power of attorney is invalid. straightforward disagreeing with the principal's choice of agent is not enough.

These lawsuits are expensive and time-consuming. You will need an attorney, and the case can take months or years. Courts are reluctant to overturn a document the principal signed willingly, so challenges succeed only when the evidence of invalidity is strong.

How to report an agent who is abusing their authority

If a family member believes the agent is stealing money, making unauthorized decisions, or otherwise misusing the power of attorney, they can report the abuse without going to court first. The options depend on what the agent is doing and where the principal lives.

Contact your state's attorney general office, which often has a consumer protection division that investigates financial abuse. You can also report to adult protective services if the principal is over 60 or disabled and the abuse involves neglect or exploitation. If the agent is a professional (a lawyer, accountant, or financial advisor), you can file a complaint with the state licensing board that oversees that profession.

If the principal's money is held in a bank account or investment account, notify the bank or financial institution directly. Many institutions have fraud departments and can freeze accounts or require additional authorization before the agent can withdraw funds. Keep records of any suspicious transactions and provide them to the institution.

What happens if the principal wants to revoke the power of attorney themselves

The principal can revoke a power of attorney at any time, as long as they have the mental capacity to understand what they are doing. They do not need a reason and do not need the agent's permission. The revocation should be in writing, signed, and dated.

The principal should give written notice to the agent directly and send copies to anyone who might rely on the power of attorney — banks, healthcare providers, or other institutions the agent has been dealing with. Some states require the revocation to be notarized or recorded with the county clerk, depending on the type of power of attorney.

If the principal no longer has mental capacity — for example, they have advanced dementia — they cannot revoke the document themselves. A family member would then need to go to court and seek guardianship or conservatorship, which is a separate legal process that can take weeks or months.

The difference between challenging validity and stopping misuse

These are two separate problems that require different solutions. Challenging validity means arguing that the power of attorney should never have been valid in the first place — that it was signed under duress or the principal lacked capacity when they signed. Stopping misuse means the document is valid, but the agent is breaking the law by using it wrongly.

If you believe the power of attorney itself is invalid, you need a lawyer to file a lawsuit. If you believe the agent is committing fraud or theft, you can report to law enforcement, the attorney general, or adult protective services without filing a civil lawsuit. You can do both at the same time, but they are separate actions with different outcomes.

What happens when the principal dies

A power of attorney ends when ready when the principal dies. The agent's authority ceases, and they cannot sign documents, access accounts, or make decisions on behalf of the deceased person. Any attempt to use the power of attorney after death is illegal.

After death, the principal's estate is handled through probate (if there is a will) or by state intestacy law (if there is no will). A family member may become executor of the will or administrator of the estate, but that is a different role with different legal authority than a power of attorney agent.

If the agent continues to access accounts or sign documents after the principal's death, that is fraud. Family members should notify the bank or institution when ready and contact law enforcement.

Frequently Asked Questions

Can a doctor or hospital ignore a power of attorney?

A healthcare power of attorney is valid once it is signed and meets state requirements. A doctor cannot ignore it straightforward because family members object. However, if the family believes the agent is making decisions that harm the patient or that the document was signed under duress, they can petition the court for an emergency order to suspend the agent's authority while the case is heard.

What if two family members disagree about who should be the agent?

The principal decides who the agent is, not the family members. If the principal is still alive and has capacity, they can change the agent by revoking the old power of attorney and signing a new one. If the principal lacks capacity and no valid power of attorney exists, a family member can petition the court for guardianship or conservatorship, which gives the court power to decide who manages the principal's affairs.

Can a power of attorney be forged?

Yes. If a family member believes the principal's signature was forged or the document is fraudulent, they can challenge it in court. This requires evidence — handwriting analysis, testimony that the principal was not present when it was signed, or proof that the document does not match the principal's actual wishes. Forgery is also a crime, so law enforcement can be involved.

What if the agent and the principal are in a relationship and the family thinks it is a scam?

Report the suspected abuse to adult protective services, the attorney general, or law enforcement. Provide any evidence of financial exploitation, isolation, or coercion. If the principal still has capacity, they can revoke the power of attorney themselves. If they lack capacity, a family member can petition the court for guardianship and ask the judge to suspend the agent's authority pending investigation.