Sibling Dispute Over Power of Attorney in Missouri

Your parent named one sibling as power of attorney, and the others think it was a mistake. Maybe the agent is making financial decisions without consulting anyone. Maybe they're refusing to share account information. Or maybe the family simply can't agree on who should be in charge of a parent who's losing capacity.

Sibling disputes over power of attorney are one of the most common elder care conflicts in Missouri — and they escalate fast because the legal stakes are higher than most families realize.

What the Agent Can and Can't Do Under Missouri Law

The agent named in a Missouri durable power of attorney is bound by fiduciary duties under RSMo § 404.714. That means they must:

• Act in the principal's best interest, not their own
• Keep the principal's assets separate from their personal funds
• Maintain accurate records of every transaction
• Avoid conflicts of interest and self-dealing

These aren't suggestions. An agent who commingles funds, makes unauthorized gifts to themselves, or fails to keep records can be held personally liable. Any interested person — including a sibling — can petition the court for an accounting.

The most common trigger for sibling disputes isn't dramatic theft. It's something more mundane: one sibling moves in with the parent, starts using the POA to manage finances, and stops communicating with the other siblings about what they're spending and why.

How to Challenge a POA Agent in Missouri

If you believe a sibling is misusing a parent's power of attorney, Missouri law gives you several options:

Request an informal accounting first. Ask the agent directly to provide bank statements, receipts, and a summary of expenditures. Under RSMo § 404.714, the agent has a legal duty to keep records — but Missouri doesn't require them to proactively share those records with other family members unless the POA document or a court order says otherwise.

Petition the probate court. If the agent refuses to account or you suspect financial exploitation, you can file a petition in the probate division of your parent's county circuit court. The court can:

• Order the agent to provide a full accounting
• Remove the agent and appoint a replacement
• Freeze the principal's accounts pending investigation
• Convert the voluntary POA arrangement to a court-supervised conservatorship

Report to Adult Protective Services. If you suspect financial exploitation of a vulnerable adult, contact the Missouri Division of Senior and Disability Services elder abuse hotline. APS can investigate independently and refer cases to law enforcement.

The Public Administrator Risk

This is the outcome most families don't see coming. When siblings file competing petitions — one to remove the current agent, another to be named agent themselves — the probate judge often decides that appointing any family member is contrary to the parent's best interests.

Under RSMo § 475.050, the court can appoint the County Public Administrator as guardian and conservator. The Public Administrator is an elected or appointed county official who takes complete control over the parent's placement, medical decisions, and financial management. They're not required to consult with, notify, or obtain consent from any family member when making decisions.

Once a Public Administrator is appointed, the family loses most of its practical influence. Getting the appointment reversed requires demonstrating to the court that family dynamics have stabilized — which is hard to do after contentious litigation.

Preventing the Dispute Before It Starts

The best protection is building transparency into the POA from the beginning:

• Name a successor agent in the document so there's a clear backup if the primary agent can't serve or needs to be removed
• Include an accounting clause requiring the agent to provide annual financial summaries to other named family members
• Have the conversation early — when a parent still has full capacity, a family discussion about who will manage finances and healthcare decisions prevents surprises later
• Consider co-agents carefully — Missouri allows naming two agents to act jointly, but this can create deadlock if they disagree on routine decisions like bill payments

If your family is navigating a Missouri POA dispute or trying to prevent one, the Missouri Power of Attorney & Guardianship Kit covers the fiduciary duties, accounting requirements, and the exact process for structuring a POA that minimizes sibling conflict.

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