For eighteen years you have made the decisions. You signed the school forms, spoke to the doctors, managed the appointments and the money. Then your child turns 18, and in the eyes of the law that authority quietly ends. Families are often surprised by this, and the surprise usually arrives at an inconvenient moment: a hospital that will not share information, a bank that will not talk to you, a form that now requires your adult child's own consent. This guide explains what changes at 18 and the protective measures Quebec offers, so you can plan ahead instead of scrambling.
One note before we begin. Nothing here is legal advice or a diagnosis. Every young person is different, and the right measure depends on that specific person's abilities and needs. This is a map of the options, not a verdict on which one your family needs.
What actually changes at 18
While your child is a minor, you are their tutor automatically. The law gives parents authority over a minor child's person and property without anyone applying for anything. That automatic authority ends on the eighteenth birthday. From that day, your son or daughter is, legally, an adult who makes their own decisions, even if their disability means they cannot do so safely.
This does not create a problem for every family. Many autistic adults and adults with an intellectual disability can make their own decisions, sometimes with support, and need no legal measure at all. The question is not the diagnosis. The question is whether this particular young adult can understand and make the decisions their life requires, alone or with help. Where they cannot, Quebec offers a set of measures, and since the reform that came into force on November 1, 2022, those measures are designed to be tailored to the person rather than applied as a blanket.
The measures, from lightest to most involved
1. No measure, with support in place
If your young adult can make their own decisions when someone explains things clearly and gives them time, they may not need a legal measure at all. What helps instead is practical: being named on consent forms your adult child agrees to, setting up banking with appropriate support, and keeping good communication with their care team. Starting here is appropriate when the young person can express their will and preferences and the risks are manageable.
2. The measure of assistance
Quebec's measure of assistance lets your adult child formally name one or two people to help them make decisions and to act as a recognized go-between with institutions, banks, and government bodies. The important point is that the assistant does not decide for the person and does not sign in their place. The young adult keeps full legal capacity. This fits a person who can make their own choices but wants and needs a trusted person beside them to help understand information and communicate it. I cover it in detail in the guide to the assistance measure.
3. Tutorship to a person of full age
When a young adult genuinely cannot make decisions about their person, their property, or both, even with support, the family usually applies for tutorship to a person of full age. Since the 2022 reform, tutorship is modulated: the court tailors it to what the person actually cannot do and leaves them the autonomy to do what they can. One young adult might need a tutor only for major financial matters while keeping control over everyday choices. Another might need broader protection. A tutor is accountable, reports to the Curateur public, and is usually supported by a tutorship council, often made up of family members. The family guide to tutorship walks through how it works and what a tutor can and cannot do.
4. Temporary representation
Sometimes a young adult can manage life in general but needs someone to carry out one specific act, signing for a particular benefit, for instance, or completing a single transaction. For that narrow situation, the court can authorize temporary representation for that one act, without placing the person under ongoing tutorship. It is the most limited tool, and it is not a substitute for tutorship where ongoing protection is needed.
Why a protection mandate is not the route here.
A protection mandate is a document a capable adult signs in advance, naming who will act for them if they later lose capacity. A young person who has never had the capacity to sign one cannot use this path. That is why, for a young adult with a lifelong disability, the route runs through tutorship or one of the lighter measures, not a mandate.
How a psychosocial evaluation fits in
An application for tutorship to a person of full age requires two assessments: a medical evaluation by a physician and a psychosocial evaluation by a social worker. The psychosocial evaluation is not an IQ test or a label. It is a structured look at how your young adult actually functions in daily life: their autonomy, the decisions they can and cannot make, their support network, and the kind and degree of protection that genuinely fits them. Because the reform asks the court to tailor the measure to the person, this evaluation matters more than ever, it is what helps the court leave your young adult every bit of autonomy they can safely keep. If you would like to know what the process feels like in practice, see what to expect at a psychosocial evaluation.
When to start
The honest answer is well before the eighteenth birthday. Families who begin a year ahead tend to move calmly: there is time to gather the medical evaluation, to think about who should be tutor or assistant, and to involve the young person in a way that respects their voice. Families who begin after a crisis, when a hospital or a bank has already said no, tend to feel rushed. If your child is 16 or 17, this is the moment to start thinking about which of these measures, if any, will fit.
What to do this year
- Ask the honest question. Which decisions can your young adult make alone, which can they make with support, and which can they not make safely at all? The answer points to the right measure.
- Book the medical evaluation. If a legal measure is likely, the physician's evaluation is the document the process will require.
- Think about who. Who would act as tutor or assistant, and who would sit on a tutorship council? These are easier conversations to have early.
- Keep your child at the centre. Even where a measure is needed, the goal is to protect, not to override. Their will and preferences carry weight in the process.
If you are not sure which of these measures fits your son or daughter, that is exactly the kind of question a short conversation can clarify. I offer free 15-minute consultations, and for many families the most useful outcome is simply knowing which path is theirs and what the first step looks like.