K v. Z — Court revived heirs’ challenge to an allegedly forged handwritten will

Case
Mr. [U] [K] and Ms. [F] [K] v. Mr. [U] [Z]
Court
Court of Cassation, First Civil Chamber (France)
Date Decided
September 9, 2026
Citation
Arrêt No. 522 F-B; Pourvoi No. M 24-18.920
Topics
Wills, Standing, Confirmation, Burden of Proof

Background

[C] [K] died in 1990, survived by his wife, mother, brother, and sister. A purported handwritten will dated January 27, 1990 named his wife as universal legatee. His mother died in 2009, leaving her two surviving children as heirs, and his wife died in 2011.

In 2012, the decedent’s brother sued Mr. [Z], the successor to the wife’s rights, seeking annulment of the will as a forgery. The decedent’s sister later joined the claim. The Aix-en-Provence Court of Appeal held that the siblings’ challenge was inadmissible because the will excluded the statutory heirs other than the decedent’s mother, who held a reserved share and, in the appellate court’s view, was the only person entitled to seek annulment.

The Court’s Holding

The Court of Cassation quashed the appellate judgment in its entirety. Under former Civil Code Articles 970 and 1001 and Code of Civil Procedure Article 31, an action to annul a handwritten will that was not written entirely in the testator’s hand is available to anyone with an interest in the claim. The siblings, as the decedent’s privileged collateral heirs who were excluded from the estate by the challenged testamentary disposition, had both standing and a legitimate interest to sue.

The Court also held that the appellate court had improperly reversed the burden of proof on confirmation of the will. A defendant who contends that an otherwise void act was confirmed must prove that confirmation, including voluntary performance with knowledge of the defect. Mr. [Z], therefore, bore the burden of proving that the decedent’s mother knowingly confirmed the disputed will; the siblings were not required to prove that she had been unaware of its alleged defect.

The case was remanded to the Lyon Court of Appeal. The Court of Cassation did not determine whether the will was forged or invalid on the merits.

Key Takeaways

  • A statutory heir excluded by a handwritten will may have standing to seek its annulment for failure to satisfy the handwriting requirement.
  • An absolute-nullity action based on a will’s formal defect is open to every person with a legitimate interest, not only an heir holding a reserved share.
  • The party asserting that a void act was confirmed bears the burden of proving knowing confirmation.

Why It Matters

The decision prevents a testamentary disposition itself from being used to deny standing to the statutory heirs whom it excludes. In disputes over handwritten wills, courts must separately assess the claimant’s interest in challenging the instrument and the ultimate merits of the alleged defect.

It also clarifies that silence or failure to sue during an heir’s lifetime does not shift the evidentiary burden to that heir’s successors. The party relying on confirmation must establish that the heir acted voluntarily with knowledge of the defect.

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