Finding out that your sister has power of attorney over your mother can leave you with a lot of questions.
What exactly can your sister do? Can she control your mother’s money or property? Can she make decisions about your mother’s care or even stop you from seeing her?
If you’re feeling confused or concerned, you’re definitely not alone.
And if you’re trying to understand what your sister’s role actually means and what you can do if something doesn’t seem right, this post is for you.
Does My Sister Control Everything My Mother Owns?
No. Having power of attorney does not automatically transfer ownership of your mother’s home, bank accounts, investments, or other assets to your sister.
Your mother is generally called the principal, while your sister is the agent or attorney-in-fact.
Your sister can use the powers your mother gave her, but she must stay within those powers.
A POA may allow your sister to:
- Pay bills
- Manage bank accounts
- Handle investments
- Sign documents
- Deal with property
Some documents give broad authority, while others limit the agent to specific tasks.
There is also a major difference between using your mother’s money for her benefit and using it for personal purposes.
Paying your mother’s bills, buying groceries, or arranging care can be part of managing her affairs. Taking her money for your sister’s own expenses is a different matter.
Also Read: How To Report A Forged Will
Can My Sister Keep Me From Seeing My Mother?
No, she generally has no legal right to block you from visiting or calling your mom.
A financial or standard healthcare power of attorney does not grant physical custody over an adult.
Unless your sister went through the courts to become your mom’s court-appointed legal guardian with specific visitation powers, she cannot bar the door or screen visits based on personal grudges.
Your mom is an adult with fundamental human rights, including the freedom to spend time with whoever brings her comfort.
Can My Sister Make Medical Decisions For My Mother?
Your sister can only make medical choices if your mom signed a specific healthcare directive and cannot make those decisions on her own.
A standard financial power of attorney deals strictly with bank accounts, utility bills, and real estate, meaning it gives zero authority inside an exam room or hospital.
For healthcare choices, your mom would have had to execute a separate document, often called a healthcare proxy or medical power of attorney. Even with that paperwork signed, your sister cannot override your mom while your mom is awake, alert, and able to express her own medical wishes.
Also Read: Who Can Change A Will After Death?
Medical authority only activates when doctors officially determine your mom lacks the capacity to understand treatment options.
Until that clinical threshold is met, the doctors will listen directly to your mom, not your sister.
What Are My Rights As My Mother’s Child?
You retain your role as an equal child in the family, though you do not automatically get legal veto power over your sister’s valid decisions.
This is often the hardest pill to swallow during family transitions because the law separates legal authority from biological ties. You have the right to visit your mom, talk to her, advocate for her comfort, and show up as a loving family member.
What you don’t inherently have, however, is an automatic legal right to demand daily bank statements or countermand a validly appointed agent without going through formal channels.
Your biggest right is the ability to step in and alert authorities or courts if you observe neglect, fraud, or isolation.
What If I Think My Sister Is Misusing The Power Of Attorney?
You should act immediately by gathering solid facts, documenting red flags, and alerting protective services or an attorney.
Suspecting misuse is painful, but you need to look past family squabbles and focus purely on your mom’s well-being. Look out for glaring signs such:
- Unexplained withdrawals or transfers from your mother’s accounts.
- Your mother’s property being sold or transferred without a clear explanation.
- Your sister using your mother’s money for personal expenses.
- Important financial information suddenly being hidden from your mother.
If your sister completely refuses basic transparency about how your mom is being cared for, your instincts are probably telling you something real.
If you suspect financial exploitation or physical neglect, contact your local Adult Protective Services agency right away. They are trained investigators who can step in without requiring you to file a lawsuit first, ensuring your mom’s immediate safety and financial stability.
Can A Power Of Attorney Be Revoked?
Generally, a person who created a power of attorney can revoke it while they still have the legal capacity to do so.
Your mother may be able to cancel your sister’s authority and appoint someone else.
The revocation usually needs to be properly documented, and banks or other organizations dealing with the agent may need notice.
Things can be more complicated if your mother no longer has the capacity to revoke the POA herself. In that situation, family members may need to explore other legal remedies rather than simply asking her to sign a new document.
Can I Challenge My Sister’s Power Of Attorney?
You may be able to challenge a POA, but a family disagreement by itself does not necessarily make the document invalid.
A legal challenge may involve claims that your mother lacked the required capacity when she signed the document, that fraud or undue influence was involved, or that your sister is misusing the authority she received.
A court may also look at the circumstances surrounding the POA, your mother’s condition when it was signed, and what the agent has done since then.
Also Read: Can A Nursing Home Override A Power Of Attorney?
What Should I Do If I Don’t Trust My Sister With My Mother’s Affairs?
Start by getting a copy of the power of attorney if you are legally able to obtain one.
Read it carefully, because the document may answer questions that family arguments cannot.
Then make a simple record of your concerns. Write down dates, transactions, property changes, messages, and other facts. Separate what you know from what you suspect.
You should also avoid taking matters into your own hands. Do not access your mother’s accounts, remove her property, or make financial decisions for her without proper authority just because you are worried about your sister.
If you believe your mother is being financially exploited, neglected, or abused, consider contacting an attorney or the appropriate protective agency in your state.
If there is immediate danger to your mother’s safety, contact emergency services or local authorities.
Bottom Line
When your sister has power of attorney over your mother, she is legally obligated to act as a fiduciary solely in the parent’s best financial and healthcare interests.
While a POA grants the agent the authority to manage bank accounts, pay bills, and make medical decisions, it does not grant absolute control, ownership of assets, or the right to isolate the parent from other family members.
Siblings retain the right to dispute the POA, request financial accountings, or report suspected abuse to Adult Protective Services if the agent mismanages funds or fails to provide proper care.