Challenging Paternity in Quebec: What Changed in 2023

The famous one-year deadline no longer exists, but another obstacle has taken its place: uninterrupted possession of status, now set at twenty-four months.

Éric and Mylène lived together for nine years in Gatineau. Their daughter Alice is now six. Éric signed the declaration of birth, did the sleepless nights and the Saturday-morning soccer tournaments. Then the separation turns ugly. One evening, mid-argument, Mylène blurts out that Alice may not be his. Éric no longer sleeps. He wants to know — and to know whether, if so, he can have his name removed from the act of birth and stop paying support. Across town, Simon is living the mirror-image story: he believes he is the biological father of a two-year-old who bears another man’s name, and nobody will talk to him.

Both situations are governed by the same rules, and those rules are no longer the ones found in many texts still circulating online.

How filiation is established today

Filiation is the legal bond between a child and their parents. Since the June 2023 reform, the Civil Code starts from a simple rule: a child’s filiation is proved by their act of birth, regardless of how it was established (art. 522.1 C.c.Q.).

It is established with respect to the person who gave birth by the fact of the birth itself, and with respect to the other parent by acknowledgment of the bond in the declaration of birth. Failing that acknowledgment, uninterrupted possession of status suffices (art. 523 C.c.Q.).

Then comes the presumption of parentage: a child born during a marriage, a civil union or a de facto union, or within three hundred days after it ends, is presumed to have the spouse of the person who gave birth as their other parent (art. 525 C.c.Q.). This is where Bill 2, assented to on June 8, 2022, came in: before it, the presumption covered only marriage and civil union. Many common-law partners still do not know this.

The frequent trap: believing that signing the declaration of birth is a mere formality. It is the founding act of the legal bond.

The real lock: uninterrupted possession of status

The phrase sounds intimidating; the reality is down-to-earth. Uninterrupted possession of status — the civil law’s possession constante d’état — means behaving as a child’s parent, in the eyes of everyone, on a continuous basis. It is established by a sufficient combination of facts indicating the relationship of filiation between the child and the person conducting themselves as the parent.

The 2023 reform added two details that change everything. The conduct must begin at birth and continue for at least twenty-four months, barring exceptional circumstances; previously, the law said nothing about duration. And possession of status cannot be exercised by two people at the same time (art. 524 C.c.Q.).

The effect is radical: no one may claim a filiation contrary to the one given by their act of birth combined with uninterrupted possession of status consistent with that act, and no one may contest the status of a person whose possession of status matches their act (art. 542.19 C.c.Q.). In other words, once the name on the act of birth and the parental conduct have matched for two years, the filiation becomes practically untouchable — even with a conclusive DNA test in hand.

The Code provides a tiebreaker where two people have acted as parent at the same time: the biological bond prevails, except for a child born of a procreation involving a third party, where the parental project wins out.

The frequent trap: requesting a DNA test in the belief that the result will settle everything. The result is useless if the lock is closed.

Contesting: the one-year deadline is gone

This is the least-known and most important change. Under former article 531 C.c.Q., the presumed father had to contest within a year of the presumption taking effect, and the mother within a year of the birth. That provision has been repealed since June 6, 2023.

Today, any interested person, including a parent of the child, may contest by any means the filiation of a person who does not have uninterrupted possession of status consistent with their act of birth (art. 542.21 C.c.Q.). Above all, actions respecting filiation are now imprescriptible — no limitation period applies (art. 542.32 C.c.Q.). The only surviving deadline is for heirs, who must act within three years of the death of the child or of the parent, on pain of forfeiture.

The legislature thus traded a logic of deadlines for a logic of lived conduct. It is no longer the calendar that closes the door on you; it is what you did — or did not do — during the first two years of the child’s life.

One notable exception was introduced in 2023: a child may contest their filiation on the ground that they were born of a sexual assault committed by their parent, whether or not there is uninterrupted possession of status, if their interest so requires (art. 542.22 C.c.Q.).

The frequent trap: relying on an online text, or even a government page that has not been updated, that still refers to the one-year deadline.

The DNA test: what the court can order

A court seized of an action respecting filiation may, at the request of an interested person, order an analysis to establish the genetic profile of a person contemplated by the action (art. 542.30 C.c.Q.).

An essential nuance: where the action seeks to establish a filiation — Simon’s case — the court may make that order only if there is already a commencement of proof, or if presumptions arising from clearly established facts are serious enough to justify it. No fishing expeditions for DNA, in other words: you must first bring something to the table — photos, messages, testimony, cohabitation around the time of conception.

The court sets the conditions of the sampling so as to interfere as little as possible with the person’s bodily integrity. And if someone refuses without justification to submit to it, the court may draw a negative presumption from the refusal. It is not automatic, but an unexplained refusal comes at a steep price.

To have a filiation established, the vehicle is an action to claim status (réclamation d’état). If the child already has an established filiation, that action must be joined to a contestation of the existing filiation (art. 542.23 C.c.Q.).

The man who learns he is not the biological father

Back to Éric. His name appears on the act of birth and he has behaved as Alice’s father since her birth, well beyond twenty-four months. The lock of article 542.19 works against him, whatever a test might show.

Conversely, where the bond was never actually lived out, contestation becomes possible again, with no time limit.

Then there is the burning question: what about the child support already paid? If the filiation is annulled, the support obligation ends for the future. For the past, there is no automatic reimbursement rule in the Civil Code, and the alimentary nature of the sums, already spent on the child, weighs heavily. It is an issue argued case by case. Beware of anyone who promises you a refund in advance.

Finally, a word on knowledge of origins: since June 6, 2025, a person born of a procreation involving a third party has the right to obtain, from the designated authority, that third party’s name and profile information, subject to a refusal of contact. It falls to the parents to inform the child.

A genuine doctrinal debate runs through this whole area: should biological truth prevail, or the stability of the lived bond? The legislature chose stability by tightening possession of status, while abolishing the deadlines and reintroducing a biological tiebreaker in certain conflicts. That hybrid approach has generated a great deal of commentary.

Key takeaways

The one-year deadline of former article 531 C.c.Q. is abolished: since June 6, 2023, actions respecting filiation are not subject to any limitation period.
The real obstacle is uninterrupted possession of status consistent with the act of birth: parental conduct from birth, continuing for at least twenty-four months.
Since June 8, 2022, the presumption of parentage also applies to common-law (de facto) spouses.
A DNA test is not granted on mere request: to establish a filiation, you first need a commencement of proof.
An unjustified refusal to submit to the test can be held against you.
No rule provides for automatic reimbursement of support already paid: have your situation assessed before acting.