Who Can Override a Power of Attorney? What Adult Children Need to Know

When a power of attorney is in place and a family disagrees about how it's being used — or whether it should exist at all — the question of who has authority to override it becomes urgent and contested. This comes up in two very different situations: when a sibling wants to challenge an agent's decisions, and when the agent is acting against the principal's best interests. Understanding who can actually override a POA, and through what process, is essential for any family navigating this terrain.

First: Who Can Revoke a POA (The Clean Case)

The simplest answer to "who can override a power of attorney" is: the person who created it, as long as they have mental capacity.

A power of attorney is always revocable by the principal — your parent — as long as they are legally competent. No one else's consent is required. Your parent can revoke their POA by:

• Signing a written revocation and notifying the agent and any institutions that were relying on the POA
• Creating a new POA (which typically supersedes the old one)
• Verbally revoking it in some states, though written revocation is strongly recommended

This means: if your parent is still mentally competent and wants to remove someone as their agent, they can do so. This is the cleanest path.

When the Principal No Longer Has Capacity

Once your parent has lost mental capacity — due to dementia, a stroke, or another condition — they can no longer revoke their own POA. At that point, the question of who can override it becomes a legal one.

The answer: a court.

If there are grounds to believe that the agent is acting improperly, family members or others with a legitimate interest can petition a court to:

1. Remove the agent and appoint a new one (in states where this is permitted under the POA statute)
2. Appoint a guardian or conservator who then supersedes the agent's authority
3. Invalidate the POA entirely if it can be shown that it was signed under fraud, duress, or when the principal already lacked capacity

This is not a simple or fast process. Court proceedings take time, cost money, and require evidence. "I don't like how my sibling is handling Mom's finances" is not sufficient grounds — there must be demonstrable harm or legal violation.

Grounds to Challenge a POA

Not every family dispute justifies a legal challenge. Courts will consider overriding an agent's authority when there is evidence of:

Breach of fiduciary duty: The agent is using the principal's assets for their own benefit rather than the principal's. Examples include transferring money to themselves, paying their own debts with the principal's funds, or making gifts to themselves that the POA document doesn't authorize.

Fraud or undue influence in creating the POA: If the agent coerced or deceived the parent into signing the document, the POA may be void from the beginning. Proving this requires evidence — medical records showing incapacity at signing, witness testimony, or communications showing pressure.

The principal lacked capacity when signing: If the parent had already been diagnosed with dementia at the time they signed the POA, the document's validity may be challengeable. This is why getting a POA in place early — before any diagnosis — is so important.

Negligence or mismanagement: Failing to pay the principal's bills, allowing insurance to lapse, or making reckless investment decisions may constitute a breach even without outright theft.

The Role of Adult Protective Services

In cases where a family member suspects an agent is financially exploiting a vulnerable adult, Adult Protective Services (APS) is often the first call to make. APS can investigate and, if they find evidence of abuse, can intervene with or without a court proceeding. This is typically faster than a full court case.

APS contact: every state has an APS agency. The Eldercare Locator (1-800-677-1116) can connect you to the right agency.

What Siblings Cannot Do

This is where many family conflicts go sideways. A sibling who disagrees with the named agent's decisions does not have an automatic right to override those decisions. Specifically:

Disagreeing with medical decisions does not give another family member the right to override the healthcare proxy, unless the proxy is acting outside the scope of the POA document or the principal's documented wishes.

Believing you would "do a better job" is not a legal basis for removal.

Being a co-executor of the will gives no authority over decisions during the parent's lifetime — executor authority begins only after death.

Being the "closer" sibling (geographically or emotionally) does not override a legally executed document.

If a sibling named as agent is making decisions you believe are wrong, the proper steps are:

1. Request a full accounting of how the agent is managing assets (agents have a duty to keep records and provide accounting upon request)
2. Consult an elder law attorney to evaluate whether the agent's conduct actually constitutes a breach
3. If there is genuine evidence of wrongdoing, file with APS or petition the court

When a Court Appoints a Guardian

If a court determines that the agent is unfit or that there was no valid POA in place, it may appoint a guardian (for personal/healthcare decisions) or conservator (for financial decisions). The guardian or conservator then has authority that supersedes the POA agent.

Guardianship proceedings are public, expensive, and stressful. They are also avoidable in most cases with proper advance planning. This is why having a well-drafted POA — naming a trustworthy agent, with a reliable backup, and documenting the principal's wishes clearly — is so important before any capacity questions arise.

The Most Common Scenario: Dementia and a Contested POA

The scenario families most often face: your parent was diagnosed with early-stage dementia, a sibling was already named as agent under an existing POA, and now other family members believe that sibling is not acting in the parent's best interest.

What applies here:

• If the parent still has capacity, they can revoke and re-execute a new POA. A physician can evaluate and document capacity, which protects the new document against future challenges.
• If the parent no longer has capacity, the family's options are: negotiate with the current agent (sometimes possible), petition for an accounting, or pursue court intervention.
• If the concern is financial exploitation, contact APS and an elder law attorney immediately.

Getting the POA structure right before cognitive decline begins is the most effective protection against all of these scenarios. That means naming an agent you genuinely trust, naming a clear backup, and documenting your parent's values and wishes elsewhere — in a living will, a conversation guide, or a workbook — so there's an independent record of what they wanted.

Protecting the Agent as Well

It's worth acknowledging that serving as a POA agent is genuinely difficult. Agents are often making significant decisions under stress, while grieving, and sometimes while under pressure from other family members who second-guess every choice.

Agents protect themselves by:

• Keeping meticulous records of every transaction
• Keeping their own funds completely separate from the principal's
• Following the principal's documented wishes as closely as possible
• Consulting an elder law attorney when making significant decisions
• Communicating proactively with other family members (even if not legally required)

The End-of-Life Planner workbook includes a Financial Overview worksheet and Document Locator designed to create a paper trail from the beginning — so that when family members ask questions later, the agent has clear documentation of every decision made on the principal's behalf.

Key Takeaways

• The principal can always revoke their own POA if they have capacity
• Once capacity is lost, only a court can remove an agent
• Grounds for challenge include fraud, undue influence, capacity at signing, and fiduciary breach
• Disagreement with decisions is not sufficient grounds to override a legally executed POA
• APS is often faster than court proceedings when exploitation is suspected
• Proper planning upfront — naming the right agent with the right backup — prevents most of these conflicts