In recent decision of Aulinger v. Oda, 2026 BCCA 13, the B.C. Court of Appeal discusses the legal nature of joint wills and mutual wills in B.C. and the effect of a will-maker’s revocation of a joint will on other will-makers.

Background

Johannes and Daniela Siebert, married German citizens, executed a single handwritten will together in Germany in 1995. The will consisted of one sentence and was signed by both spouses:

“In case of our death, we Daniela Siebert and Johannes Siebert, name Mr. Martin Steger and Ms. Gertrud Steger as universal heirs of our entire estate.”

Mr. and Ms. Steger were Ms. Siebert’s parents.  The Sieberts later moved to British Columbia, where they owned property.  Ms. Siebert prepared a new will in B.C. in 2019 and revoked any previous wills; she died shortly thereafter.   Mr. Siebert did not make any fresh wills after 1995, and died in 2022.

Following Mr. Siebert’s death, Ms. Steger applied to the B.C. Supreme Court for a grant of administration and sought to prove the 1995 will in solemn form. Ms. Oda came forward and opposed that application, asserting that she was Mr. Siebert’s spouse at the time of his death. Ms. Oda argued that the 1995 will had been revoked by Ms. Siebert and that therefore Mr. Siebert had died intestate (without a will).

The Chambers judge found that the 1995 will was valid under German law and could be recognized and admitted for probate under the Wills, Estates and Succession Act (WESA) unless it had been revoked. Whether it was revoked by the 2019 will was to be determined by B.C. law. The judge characterized the will as a mutual or joint will but used the terms interchangeably; it was held that the Seiberts intended for the will’s disposition to apply in the event they died at the same time or if one died without having revoked their participation. The Court concluded that Ms. Sieibert revoked the 1995 will for both herself and her husband when making her 2019 will.

Ms. Steger appealed the decision and the Court of Appeal allowed the appeal finding multiple errors, including in the court’s treatment of the legal nature of the will and the effect of Ms. Siebert’s revocation.

Joint Wills and Mutual Wills

The Court of Appeal clarified the distinct legal nature and effect of joint wills and mutual wills.

The Court described joint wills as follows, citing a description in Halsbury’s Laws of England:

257. Joint Wills. A joint will is a will made by two or more testators contained in a single document, duly executed by each testator, and disposing either of their separate properties or of their joint property. It is not, however, recognized in English law as a single will. It is in effect two or more wills; it operates on the death of each testator as his will disposing of his own separate property; …

The Court made clear that the “revocation of a joint will by the testator who dies first is not a revocation of the joint will as it pertains to the surviving testator – it is only a revocation of the revoking testator’s will: WESA, s. 55.”

A mutual will can be contained in a joint will or may be in separate documents. The hallmark of a mutual will is that testators make reciprocal testamentary dispositions pursuant to an agreement not to revoke them once the other has died. For example, two spouses enter into a mutual wills agreement whereby they agree to leave their estate to each other, but also agree that upon the death of the survivor of the two of them that the survivor’s estate (which would include the estate of the spouse who died first) will go to their children. While a mutual will can be revoked before either party’s death, once one testator dies, the other is bound by their agreement. Where the surviving testator tries to revoke, equity will intervene and a constructive trust in favor of the intended beneficiary of the mutual will is imposed.

Analysis

The Court of Appeal found that errors were made in the characterization of the Siebert’s will and found that the 1995 will was a joint will. The Court of Appeal also found errors in the lower court’s interpretation that the 1995 will was only intended to dispose of the Sieberts’ estate to the Stegers in the event they died simultaneously or if one of them died without having revoked their participation; there was no evidence that the Sieberts considered revocation or had a reciprocal agreement.

The Court of Appeal affirmed that as the 1995 will was a joint will, and was therefore at common law two separate wills, Ms. Seibert’s 2019 revocation did not revoke the will for Mr. Seibert. The 1995 will was in effect when Mr. Seibert died in 2022; he did not died intestate.

Takeaways

• Joint wills are not a single will though they are contained in a single document. A joint will operates on the death of each testator as their own separate will.
• One testator’s revocation of a joint will does not revoke it for the other testators.
• A mutual will requires evidence of an agreement not to revoke.