My Sister Controls All of My Mother’s Decisions

My Sister Controls My Mother’s Decisions: What Are HER Rights in Quebec?

If your sister controls all of your mother’s decisions, manages her money, prevents other family members from speaking with her, or makes every decision on her behalf, you may be wondering whether this situation is legal. In Quebec, no child automatically has the legal authority to control a parent’s personal decisions, financial affairs, or property simply because they are a son or daughter.

Whether the issue concerns your mother’s money, healthcare, property, living arrangements, or legal documents, it is important to determine whether your sister has actual legal authority or is simply taking control without authorization.

Can My Sister Legally Control My Mother’s Decisions?

The answer depends on your mother’s legal capacity and on whether your sister has been legally authorized to act.

If your mother is still mentally capable, she has the right to make her own decisions. She may choose to ask your sister for help, but that does not give your sister the authority to control her finances, prevent visits, make healthcare decisions, or exclude other family members unless your mother freely wishes it.

If your mother has become incapable of making informed decisions, only a person who has legal authority under Quebec law may act on her behalf.

What Gives Someone the Right to Make Decisions for a Parent?

Several legal situations may allow a person to act for an elderly parent.

A Protection Mandate

If your mother signed a protection mandate while she was capable and it has been homologated by the court after she became incapable, the mandatary named in that document may make decisions within the powers granted by the mandate.

Even then, the mandatary must always act in your mother’s best interests, respect her wishes as much as possible, avoid conflicts of interest, and properly manage her property.

The mandatary cannot use your mother’s money for personal purposes or ignore the legal duties imposed by the Civil Code of Québec.

A Tutorship to a Major

If no valid protection mandate exists, the court may establish a tutorship to a major when an adult becomes incapable of caring for themselves or administering their property.

The tutor is supervised under Quebec law and must manage the person’s affairs prudently, honestly, and exclusively for the benefit of the protected person.

Being appointed tutor does not allow someone to treat the person’s assets as their own.

A Power of Attorney

Many families mistakenly believe that a power of attorney gives permanent authority over an elderly parent’s affairs.

In Quebec, an ordinary power of attorney generally ceases to be effective once the person becomes incapable. It does not replace a protection mandate or a tutorship.

My Sister Is Controlling My Mother’s Money

Financial abuse is one of the most common concerns involving elderly parents.

Warning signs may include:

• Your sister refuses to explain how your mother’s money is being spent.
• Large withdrawals or unusual transfers appear in bank accounts.
• Bills remain unpaid despite sufficient funds.
• Property is transferred without clear justification.
• Your mother is pressured to sign financial documents.
• Your sister prevents anyone else from reviewing financial records.
• Your mother’s savings appear to be disappearing without explanation.

Financial exploitation of a vulnerable adult can have serious legal consequences.

My Sister Prevents Me From Seeing My Mother

Another frequent concern is when one child isolates an elderly parent from the rest of the family.

Although every situation is different, intentionally isolating a vulnerable adult may become relevant when assessing whether there is undue influence, psychological abuse, exploitation, or whether the person’s best interests are being respected.

If your mother remains capable, she decides who may visit her.

If she is incapable, the person acting on her behalf must still respect her dignity, relationships, and best interests whenever possible.

What Can I Do If I Believe My Sister Is Abusing Her Authority?

If you believe your sister is improperly controlling your mother’s decisions or money, you should gather objective information before taking legal action.

Depending on the circumstances, it may be appropriate to:

• verify whether a protection mandate has been homologated;
• determine whether a tutorship has been established;
• review the legal authority claimed by your sister;
• obtain medical and psychosocial assessments if capacity is in question;
• seek court intervention where abuse or exploitation is suspected;
• consult an experienced Quebec lawyer in elder law, family law, or protective supervision matters.

Each case depends on its own facts, and early legal advice often helps prevent further financial loss or family conflict.

Can Other Children Challenge the Situation?

Yes.

Brothers, sisters, spouses, close relatives, and other interested persons may, in appropriate circumstances, apply to the court, contest certain legal proceedings, or ask for protective measures when they believe a vulnerable adult’s rights are not being respected.

The court’s priority is always the protection of the incapable person, not the preferences of individual family members.

When Should You Speak With a Lawyer?

If your sister controls your mother’s decisions, her money, or her daily life, and you are worried that your mother is being manipulated, financially exploited, or deprived of her rights, obtaining legal advice as early as possible can help clarify the situation.

A lawyer can review the legal documents, determine who actually has authority, explain your options under Quebec law, and, when necessary, help obtain court intervention to protect your mother’s interests and property.

This text is provided for legal information purposes only. If you have a specific question regarding your personal situation, please contact a lawyer.

Allen Madelin Avocats offer consultations both in person and via videoconference. The first consultation is offered for $125.For more information, please contact us by telephone: 1 514 904 4017 or by e-mail: [email protected].