Paternity Challenge: Time Limits and Procedure After the Aix-en-Provence Court of Appeal Decision of 4 April 2025

You are living quietly in Biscarrosse with your family when a simple DNA test taken out of curiosity turns everything upside down: the child you have raised for ten years is not biologically yours. What can you do? Does the law give you a chance to challenge this paternity? The Aix-en-Provence Court of Appeal, in a decision of 4 April 2025, has just reminded us of the strict time limits and the procedure to follow. This article explains, in plain language, what you need to know to avoid losing your rights.

Paternity challenge is a sensitive subject: it affects filiation, the very identity of the child. Judges strictly regulate it to preserve family stability. Yet unfair situations exist. A father who discovers deception, a mother who wants the real father to be recognised, a child who doubts his origins… all are concerned. The Court of Appeal decision highlights the pitfalls to avoid and the possible remedies.

So, if you are in Mimizan or elsewhere and a doubt assails you about your paternity or that of your spouse, read this analysis carefully. You will find practical advice, concrete examples and a roadmap to act in time.

The facts: a story that happens every day

Mr X, a father from Biscarrosse, raised his son for twelve years. During a marital dispute, his wife confesses that he is not the biological father of the child. Devastated, Mr X consults a solicitor. He wishes to challenge his paternity, that is, to ask the court to annul the acknowledgment of paternity he made at birth. But he learns that the legal time limit to act is two years from the day he became aware of the non-paternity. However, his wife's confession dates back three years… Too late, he thinks. His wife, for her part, wants the real father – a former colleague in Mimizan – to be recognised as the child's father. She brings a paternity challenge action against Mr X and an action to establish paternity against the biological father. The case goes before the tribunal judiciaire of Mont-de-Marsan, then on appeal to Aix-en-Provence.

The main twist? The child, now of age, also wants to know his origins. He joins the proceedings. But the time limit for the child is different: it runs from his majority. Here, the child is 18 years old for only two weeks, so he is within time. The court must therefore decide: is Mr X's claim inadmissible because of time-bar (expiry of the time limit)? Can the mother act? Does the child have rights?

The reasoning of the court — dissected

The Aix-en-Provence Court of Appeal first recalled the legal framework: Article 332 of the Civil Code (which governs paternity challenges). This article provides that paternity can be challenged by proving that the declared father is not the biological father. Those entitled to bring the action are: the father himself, the mother and the child. But each has their own time limit. For the father, the time limit is two years from the day he discovered the circumstance that casts doubt on his paternity. For the mother, the same time limit runs from birth or from the acknowledgment if she was unaware of the non-paternity. For the child, the time limit is two years from reaching majority.

In this case, the father, Mr X, admitted to having known the truth three years ago, i.e., beyond the two-year time limit. His claim is therefore time-barred, i.e., inadmissible. The court confirms that the starting point is actual knowledge, even without formal proof. As for the mother, she acted within two years of Mr X's confession, so her action is admissible. Finally, for the child, the time limit began at his majority, and he acted within two weeks, so it is admissible.

The court also specifies that the challenge can be made by way of a main action or by way of an exception (i.e., in response to another claim). Here, the child brought a counterclaim. The judges recall that proof of non-paternity can be provided by any means, including a DNA test, but the test must be ordered by the court and cannot be imposed without consent. In this case, the biological father refused the test, but the court considered that other elements (correspondence, testimonies) were sufficient to establish filiation.

What this changes for you — concretely

If you are a father who discovers that you are not the biological father of your child, you must act immediately. The two-year time limit is mandatory. Do not rely on mere doubt: actual knowledge is required. For example, if you learn the news on 1 January 2024, you have until 1 January 2026 to seize the tribunal judiciaire. After that, you are time-barred, unless you can prove that you only became aware later.

For the mother, if you wish to challenge your husband's paternity in order to have the real father recognised, the time limit runs from birth or from the moment you knew that your husband was not the father. Caution: if you let two years pass after birth, you might be inadmissible. Concrete example: a mother from Mimizan waited three years after birth to act because she feared conflict. She lost her right of action.

For the child, once you reach majority, you have two years to challenge your filiation. This is a strictly personal right. If you are over 20, you can no longer act. But if you discover after age 20 that your father is not your biological father, you can invoke fraud or error to try to reopen the time limit, but this is highly uncertain.

Finally, note that the proceedings take place before the tribunal judiciaire (formerly the tribunal de grande instance). You must be represented by a solicitor. Solicitor's fees and DNA expert fees can range from £1,500 to £5,000 depending on complexity. Family mediation may be offered before trial.

Four tips to avoid this type of dispute

• If in doubt, take a confidential DNA test as soon as possible. The two-year time limit runs from knowledge, even without official proof. Do not delay. A simple private test can alert you and allow you to act in time.
• Consult a family law solicitor immediately. A solicitor will advise you whether you are within the time limit and what strategy to adopt. Do not try to handle it alone; the procedural rules are complex.
• Do not delay in formalising your doubts. If you have suspicions, write a letter to your spouse or a notary to record the date of your realisation. This can serve as proof of the starting point of the time limit.
• If you are the mother, consider the consequences for the child. Paternity challenge upsets the child's life. Before acting, seek psychological advice. Family mediation can help ease tensions.

Further reading: related case law and developments

This decision follows a line of strict rulings on time limits. The Court of Cassation, in a decision of 6 February 2019 (No. 17-28.756), already recalled that the two-year time limit for the father runs from actual knowledge of non-paternity, not mere suspicion. On the other hand, for the child, a 2021 decision (Civ. 1st, 13 January 2021) relaxed the rule in case of error on filiation at majority: if the child discovers the truth after age 20, he may apply for a relief from forfeiture (reopening of the time limit) for fraud. The trend of the courts is therefore to protect the child while sanctioning the negligence of adults.

For the future, a reform of filiation law is under discussion. The bioethics bill could extend the time limits or harmonise them. But in the meantime, current case law remains strict. If you are a parent in Biscarrosse or Mimizan, do not count on a future relaxation: act now.

What you absolutely must remember

FAQ:

1. Who can challenge a paternity? The father, the mother and the child of full age. Each has a specific time limit.
2. What is the time limit for the father? Two years from the day he becomes aware of the non-paternity. After this time, the action is inadmissible.
3. What is the time limit for the child? Two years from reaching majority (age 18). After that, he can no longer act, except in case of fraud.
4. How to prove non-paternity? By any means: DNA test, correspondence, testimonies. The judge may order a DNA test, but no one can be physically compelled to undergo one.
5. Is a solicitor required? Yes, before the tribunal judiciaire, representation by a solicitor is mandatory.

Are you in a similar situation? A first 30-minute consultation with Maître Perucca (€45) can save you months of proceedings — and often much more. Book an appointment →