When a Manhattan family reviews their father’s bank statements and discovers unexplained transfers to a sibling’s personal account, the dynamics of estate planning shift from theoretical to urgent. If that sibling holds a power of attorney, they possess the legal authority to drain accounts, sell property, and alter beneficiary designations. When the father is in the advanced stages of cognitive decline, he cannot simply tear up the document. The family is trapped between a deteriorating parent and a rogue fiduciary. This is not merely a breach of trust—it is a crisis of stewardship.
The power of attorney is arguably the most dangerous document in a family’s legal arsenal. It grants sweeping financial control, often with zero automatic oversight. We draft these instruments to protect families, appointing a trusted custodian to manage affairs if illness or injury strikes. But when an appointed agent abuses their position, or when family relationships simply fracture, leaving that authority in place is a massive liability. Removing an agent requires deliberate, precise legal action.
When the Principal Retains Capacity
The most direct way to remove an agent is for the creator—the principal—to revoke the power of attorney. The principal must still possess the legal capacity to understand their actions. If they are of sound mind, they retain absolute control over who acts on their behalf.
Ripping up the original document or verbally firing the agent does not end the relationship. Under New York General Obligations Law (GOL) § 5-1511, a power of attorney terminates only when the principal executes a formal, written revocation. Until the agent receives actual notice, they can legally continue to act. Furthermore, any third party—a bank, brokerage firm, or title company—relying on the original document without knowledge of its revocation remains entirely protected from liability.
To execute a proper revocation, we prepare a formal document that clearly rescinds the previous appointment. This document is signed, notarized, and physically delivered to the former agent. We then send copies via certified mail to every financial institution where the principal holds accounts. We leave nothing to chance. If an institution does not have the revocation on file, the rogue agent can still empty the vault.
When the Principal Lacks Capacity
The situation complicates significantly when the principal loses the cognitive ability to execute a revocation. An individual with severe dementia cannot legally sign a new document to fire their agent. In these cases, the bad-acting agent’s authority remains intact unless third parties intervene.
Accountability.
That is what the law demands of fiduciaries. An agent acting under a power of attorney owes a strict fiduciary duty to the principal. They are legally prohibited from self-dealing, commingling funds, or making decisions that conflict with the principal’s best interests. When they breach this duty, New York law provides mechanisms for interested parties to step in and force their removal.
Under GOL § 5-1510, certain individuals can petition the court to commence a special proceeding against the agent. The court can compel the agent to produce a formal accounting of every dollar spent, or it can strip the agent of their authority entirely. The statute grants standing to initiate this proceeding to a specific list of parties, including:
- The principal’s spouse, child, or parent
- A court-appointed guardian or conservator
- The executor or administrator of the principal’s estate (if the principal has passed away)
- Any other person the court determines has a sufficient interest in the principal’s welfare
If the court finds that the agent has abused their power, mismanaged assets, or acted adversely to the principal, the judge will revoke the power of attorney. In severe cases of financial exploitation, we typically consider initiating a guardianship proceeding under Article 81 of the Mental Hygiene Law. A court-appointed guardian is granted the power to override and revoke the previous power of attorney, wresting control away from the abusive agent and securing the remaining assets.
The Stance of Financial Institutions
Families often express frustration when banks refuse to freeze an account based on a phone call alleging fraud by a power of attorney. From the bank’s perspective, they are looking at a legally binding document that explicitly authorizes the agent to make withdrawals. Financial institutions are highly risk-averse. They will not mediate family disputes, and they will not restrict an account simply because one sibling accuses another of theft.
This is why rapid, documented legal intervention is necessary. A bank will only stop honoring the power of attorney when presented with a formal written revocation from a competent principal, a court order suspending the agent’s powers, or an injunction. Waiting to see if the agent does the right thing is a strategy that usually ends with depleted accounts and forced sales of family real estate.
Deliberate Fiduciary Selection
Removing a problematic agent is a reactive measure. The proactive approach is careful, deliberate selection during the estate planning phase. We do not name agents casually. We stress-test the appointments. We build in contingencies, such as requiring two co-agents to act jointly on major transactions, or appointing an independent protector who holds the power to demand an accounting at any time.
A power of attorney is a tool of generational preservation, but in the wrong hands, it is a weapon. If you suspect an agent is abusing their authority, or if family dynamics have shifted since your documents were drafted, do not wait for the financial damage to become irreversible. Pull your existing advance directives today, review your designated fiduciaries, and if an agent is acting adversely, prepare to execute a formal revocation or petition the court under GOL § 5-1510.
