Adult Guardianship: How to Plan for the Future Care and Finances of Your Child with a Disability

Adult Guardianship | Disability Estate Planning

As your child with a disability approaches the age of 18 and transitions into adulthood, you may no longer be able to make legally binding decisions on their behalf. Adults who are unable to handle basic transactions such as paying for housing or food are extremely vulnerable. So, if you have a child or family member with disabilities, you need to consider the following questions:

Can your child’s disability limit his or her ability to make sound decisions?

Can your child be subject to undue influence?

If the answer is “yes”, how can you retain the decision-making power to protect your child‘s well-being and how can you ensure that your child will be well taken care of after you are gone? One solution is legal guardianship. 

Please note that if you live in British Columbia (B.C.), there are additional options available to support decision making known as the Representation Agreement Act. For more information on Representation Agreements and decision making for individuals without legal capacity, contact Nidus (www.nidus.ca), or a B.C. focused lawyer.

What is Legal Guardianship?

Legal guardianship for adults with developmental disabilities is a powerful legal instrument that allows parents or close family members to manage the affairs and make decisions on that person's behalf for their benefit. There are two types of guardianship:

One is for property and the other is for person. Both can be sought simultaneously. A guardian of property is appointed to manage financial affairs of a person who is mentally incapable of doing so. A guardian of person makes decisions over care, health, and safety of the incapable person.  

Because guardianship provides broad powers, the court will appoint a guardian if it is satisfied that there are no alternatives and other less restrictive ways to act on behalf of the incapable person, such as a Power of Attorney.

Powers of Attorney vs. Guardianship

Although the duties and powers of “an attorney” and “guardian” are essentially the same, there are some major differences. A power of attorney can be granted by someone who is mentally capable and may continue to be valid throughout the subsequent finding of incapacity. Guardianship is granted if a person is incapable. Guardianship essentially transfers most powers of the incapable person to a legal guardian who voluntarily offers to take the role of a fiduciary, which is someone who has a legal obligation to act in the best interest of the incapable person.

A person who grants a power of attorney chooses someone who may agree or refuse to accept this role. Powers of attorney are terminated when a court appoints a guardian. A power of attorney can have restrictions and conditions. For example, a power of attorney for property can be limited to a specific transaction, and a power of attorney for personal care can be limited to certain treatments. As a guardian you have broad powers while acting on the incapable person’s behalf for the benefit of the incapable person. For example, guardians can open or close bank accounts, redirect pension or other income, apply for benefits, pay bills, authorize transactions, instruct doctors to provide necessary treatments or administer medications to improve the incapable person's wellbeing, etc. Depending on the circumstances, there are risks associated with only relying on powers of attorney and not seeking guardianship for an incapable person. 

Why Legal Guardianship?

Legal guardianship can help provide a smooth transition of care for a child with a disability. It can also be in place to provide peace of mind after you’re gone. Parents of children with a disability often decide to pursue legal guardianship when they reach that ‘awkward age’ where they aren’t so old that they anticipate imminent death, but they do understand mortality and don’t want to leave this task to the other children. Guardianship may not be at the front of your mind right now, but it’s worth considering these key questions:

Starting the guardianship process earlier can make things easier in the future. There’s a lot to think about and guardianship can help make sure everything is in place for your child’s future.

The Legal Process

Guardianship is achieved when the court appoints a legal representative of the mentally incapable person. Someone interested in becoming a legal guardian must go through a process that involves filing court prescribed forms while complying with laws and regulations. The forms and rules are complicated, and the legal procedure must be followed properly. Typically, the court requires capacity assessments, and an opinion in a form of an affidavit from a physician may also be required to satisfy evidence of incapacity. The court also reviews a management plan, which contains detailed information about the incapable person’s finances including assets, expenses, debts, liabilities, and income. Similarly, a personal care plan is submitted where the applicant explains future care plans for the incapable person. Applicants must also notify the relevant parties.

What else should be considered?

Legal guardianship is a complicated legal process and there are always other factors to take into account, such as choosing the appropriate guardians and what to do if a guardian passes away. The information laid out in this article is just the start of understanding if guardianship is right for your situation. 

For more information on legal guardianship, you can access the following resources: 

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Adult Guardianship eBook


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Adult Legal Guardianship in Ontario – Frequently Asked Questions

1. What is adult legal guardianship?

Adult guardianship is a legal process that allows a parent, family member, or trusted person to make decisions for an adult who is unable to manage their own affairs due to a disability, illness, or cognitive impairment. It ensures that important financial, health, and personal care decisions can be made in the adult’s best interests under Ontario’s Substitute Decisions Act.

2. Who can benefit from adult guardianship?

Adult guardianship is designed for individuals over 18 who cannot make safe or informed decisions about money, housing, medical care, or personal safety. This may include people with developmental disabilities, mental health conditions, or brain injuries. Guardianship helps protect vulnerable adults while preserving their rights and dignity.

3. What happens when a child with a disability turns 18 in Canada?

When a child turns 18, they become a legal adult, meaning parents no longer have automatic authority to make medical or financial decisions. If the individual cannot manage on their own, parents must apply for legal guardianship to continue supporting them. Without it, parents may face challenges accessing health, banking, or housing services on their child’s behalf.

4. What are the three types of guardians in Ontario?

In Ontario, there are generally three types of guardians recognized under the Substitute Decisions Act:

  • Guardian of Property: Manages an incapable person’s money, income, investments, and bills.
  • Guardian of the Person: Makes decisions about health care, living arrangements, safety, and personal well-being.
  • Temporary or Statutory Guardian: Appointed for a limited time or in urgent cases, often through Ontario’s Public Guardian and Trustee (PGT), to protect an individual’s interests until a permanent guardian is chosen.

Each guardian’s authority depends on the court order or legal appointment, and all must act in the best interests of the person under guardianship while complying with Ontario guardianship law.

5. What is the difference between a Power of Attorney and legal guardianship?

A Power of Attorney (POA) is granted voluntarily by someone who still has mental capacity, allowing another person to act on their behalf. Legal guardianship is ordered by a court after someone has been found incapable of managing their affairs. Guardianship provides broader authority and is typically required when no valid POA exists or the person’s capacity has already been lost.

6. How do I apply for adult guardianship in Ontario?

Applying for guardianship involves filing documents in court under the Substitute Decisions Act, providing a capacity assessment, and submitting a management plan (for property) or a personal care plan (for personal guardianship). You’ll also need to notify all interested parties. A lawyer can help ensure that the forms and procedures meet court requirements.

7. What documents are needed for a guardianship application?

Key documents include:

  • A capacity assessment completed by a qualified professional.
  • A management plan detailing assets, income, and expenses.
  • A personal care plan outlining health and living arrangements.
  • A court application and affidavit explaining why guardianship is necessary.

Supporting medical reports or family statements may also be required.

8. How does legal guardianship affect ODSP and other government benefits?

Guardianship helps ensure continued access to ODSP, Old Age Security (OAS), and other benefits by giving the guardian authority to report income, manage assets, and communicate with government agencies. Without a guardian, payments could be interrupted or mismanaged if the person cannot manage their benefits independently.

9. What are the laws around guardianship in Ontario?

In Ontario, adult guardianship is governed by the Substitute Decisions Act, 1992 (SDA). This law outlines when a court can appoint a guardian of property or a guardian of the person for an adult who is unable to make financial or personal decisions. The SDA requires medical evidence of incapacity and proof that no less restrictive options, such as a Power of Attorney, are available. Guardians must act in the best interests of the person they represent and may be required to file plans or reports with the court to ensure proper management and accountability under Ontario guardianship law.

10. Can guardianship be shared or transferred?

Yes. Families can apply for co-guardianship, where two people share responsibilities, or designate a successor guardian in case one can no longer serve. Planning for transitions helps ensure long-term stability and prevents disruptions in care or benefit access.

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