An old conveyancing letter settled what a new will left unclear

The situation

The letter was two pages, typed on a law firm's old letterhead, folded into thirds and sitting behind a stack of mortgage statements in a drawer Ha-eun had almost skipped. It was addressed to her father Marc-Andre and his wife Anneke, dated from the year they bought their house in Paris, and most of it dealt with routine matters, a survivorship clause on the deed, instructions for a joint account. Near the bottom, one paragraph noted that the couple had asked the firm to record, for their own records, that whichever of them died last intended the full estate to be divided equally between their two children.

Ha-eun was Marc-Andre's daughter from an earlier marriage. Anneke had a son from a marriage of her own. When Marc-Andre and Anneke married, blending two households on a hotel supervisor's income and an auto body technician's wage, they had told both children, more than once, that neither would be favoured, that whatever they built together would end up split evenly regardless of whose name was on the birth certificate.

Anneke had also brought a small apartment into the marriage, inherited years earlier from her own parents in the Netherlands, modest in value but never sold, rented out quietly for extra income and always understood to be part of the same eventual estate as everything in Ontario. Anneke died first, several years before Marc-Andre. He continued as sole owner of the house, the apartment, and their combined savings, and by all accounts kept living by the arrangement the two of them had made.

When Marc-Andre died, Ha-eun, named executor, expected the estate, worth somewhere between $300,000 and $600,000 once the Ontario house, the Dutch apartment, and modest savings were added up, to divide evenly between herself and Anneke's son as promised. His most recent will, drafted a few years before his death through an inexpensive online service rather than a lawyer, did not do that clearly. It named Ha-eun as primary beneficiary, and gave Anneke's son a smaller, specific cash gift that fell well short of half the estate.

Ha-eun did not think, at first, that the discrepancy meant anything sinister. Her father had never been precise with paperwork, and she assumed the online will simply reflected whatever he had typed into a form on a given afternoon, not a considered decision to break a promise he had made to a woman he had stayed married to for the rest of his life. But the letter changed how she read that will. If the arrangement it described was real and binding, then the newer document was not just imprecise, it was a document that, if followed literally, would hand Ha-eun money that was never supposed to be entirely hers.

The legal question

What Ha-eun had found a name for, without knowing the term, was a mutual wills agreement: a binding promise between two people that once the first of them dies, the survivor will not change the arrangement they agreed to, usually to leave a combined estate to an agreed set of beneficiaries regardless of which spouse dies last. When such an agreement is proven, Ontario law will generally hold the survivor's estate to it even if a later will says something different, treating the assets as held under an obligation for the promised beneficiaries rather than freely disposable by the survivor.

The difficulty is proof. Two spouses making similar wills at the same time is not, by itself, enough to show they intended to be bound to each other permanently rather than simply making a shared decision either of them could later revisit. Courts look for something more concrete: a written agreement, clear evidence of a mutual promise not to change course, or conduct consistent with one spouse relying on the other's commitment. Without that, a later will simply governs, whatever an earlier understanding might have been.

Marc-Andre's final will, on its face, looked like exactly the kind of later document that could override an earlier informal understanding. If Anneke's son had reason to believe he had been shortchanged, he would have had a real basis to challenge the estate, arguing the mutual wills agreement bound Marc-Andre and that the online will breached it. That kind of claim can take years to resolve, cost a meaningful share of a modest estate in legal fees on both sides, and permanently damage whatever relationship remained between two adult stepsiblings.

Ha-eun's question was not whether to fight a dispute. No dispute had started. Her question was whether she could distribute the estate according to the newer will without exposing herself, as executor, to a later claim that she had ignored a binding agreement she had reason to know about, once she had read that letter.

There was also a narrower, more practical worry sitting underneath the legal question. Anneke's son had never seen the letter and had no reason to suspect it existed. If Ha-eun simply distributed the estate under the newer will and said nothing, there was a real chance he would never find out, and the estate would close quietly on terms that did not match what his mother had believed she was securing for him. That possibility did not sit easily with Ha-eun, who remembered her stepmother as someone who had treated her, from the beginning, as no different from her own son, and who had clearly intended the letter's promise to mean something.

What we did

1. Reviewed the letter's origin and content carefully, tracing it back to the law firm that had handled the house purchase decades earlier, to confirm it was a genuine, contemporaneous record rather than something written after the fact. Its evidentiary weight depended entirely on when and why it was created, so we checked the letterhead against the firm's known history, the file's internal numbering, and whether the language matched conveyancing correspondence typical of that era, before treating it as reliable evidence of anything at all.
2. Requested the original conveyancing file from that firm's archives, which still held the underlying instructions and correspondence from the house purchase decades earlier. That file gave us a documented paper trail beyond the single letter Ha-eun had found, including handwritten notes referencing the couple's discussion of the arrangement across more than one conversation with their lawyer, and confirming the letter had been sent to both spouses jointly rather than drafted at either one's request alone.
3. Searched Marc-Andre's own paperwork for corroborating evidence, going beyond the estate file itself to old banking and investment records kept in the house. We found a second, unexpected source: the beneficiary instructions on an old joint investment account he and Anneke had opened around the same period, naming both children equally and never updated in the decades since, sitting untouched in a routine account file rather than anywhere connected to estate planning.
4. Assessed whether this evidence met the threshold for a binding mutual wills agreement, applying the test courts use: was there a genuine mutual promise not to change course, shown by something more concrete than two people simply making similar decisions at the same time? We concluded that the conveyancing letter, the archived file notes, and the untouched beneficiary designation together showed exactly that kind of concrete, mutual commitment, not spouses who merely happened to think alike decades earlier.
5. Advised Ha-eun on her position as executor, explaining that distributing the estate strictly according to the later will, once she was aware of this evidence, would expose her personally to a claim from Anneke's son for breach of trust, even if he never learned about the letter on his own. An executor who knowingly disregards evidence of a competing legal claim cannot later say the distribution was made in good faith, and that exposure does not disappear simply because no one has objected yet.
6. Restructured the estate's distribution to reflect the equal split, treating the assets as held subject to the mutual wills obligation rather than freely disposable under the later will's literal wording. We prepared a clear accounting showing how the final distribution honoured both the letter's terms and the will's valid administrative provisions, such as Ha-eun's appointment as executor, which the mutual wills finding did nothing to disturb.
7. Communicated proactively with Anneke's son before any distribution occurred, sharing the evidence we had assembled and the proposed equal division directly, rather than waiting to see whether he would raise the issue himself. That disclosure meant the resolution came from agreement rather than from him discovering a shortfall after the fact and retaining his own lawyer to fight about it, a dispute that would have cost both stepsiblings far more than the estate could comfortably absorb.

The outcome

Anneke's son received his equal half of the estate, roughly matching what the mutual wills agreement had promised decades earlier, once the house, the Dutch apartment, and the remaining savings were valued and divided. He confirmed in writing that he accepted the distribution as fully satisfying any claim he might otherwise have raised, closing off the possibility of a future dispute rather than leaving it open for later.

The cost was real but contained. Tracing the archived conveyancing file, working through the cross-border transfer of the Dutch apartment's share, and preparing the documentation to support the equal split took longer, and cost more in legal and administrative fees, than simply distributing the estate according to the newer will would have. Ha-eun also gave up the larger share the online will had appeared to leave her, in favour of the split her father had actually promised.

No claim was ever filed, no court application was needed, and the two stepsiblings, who had stayed on reasonable terms through both parents' deaths, kept that relationship intact rather than testing it in a dispute over an estate their parents had never intended to divide unevenly in the first place. Because the matter was resolved through direct disclosure rather than litigation, the cross-border transfer of the Dutch apartment's share also proceeded without the added delay and expense a contested claim would have layered on top of an already complicated administration.

Anneke's son later told Ha-eun he had assumed, without ever checking, that the will would simply reflect the arrangement his mother had described to him years earlier, and that he would not have known to question it if the smaller gift had simply arrived without explanation. That admission stayed with Ha-eun. It confirmed that the letter had not just protected her from a technical exposure as executor, it had prevented a real person from quietly losing out on something his mother had promised him, with no way of ever knowing it had happened.

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