Not long ago, I saw firsthand a situation that will be familiar to anyone who practises in estates.

A grandmother, elderly and unwell, signed a new will late in life. Under that document, the bulk of her estate, including real property that had been in the family for decades, was left to one daughter. The other children, and their children, who would have shared in the estate had she died intestate, were effectively cut out.

Within weeks of her death, allegations surfaced. The excluded siblings questioned the timing of the will. They questioned their sister’s involvement. They questioned whether their mother truly understood what she was doing. Before long, the word “undue influence” was being used openly.

That dispute is not unusual. It is precisely the kind of conflict the Succession Law Reform Act<^[1] is meant to govern and, ideally, to prevent.

To understand why these disputes arise, and why they so often escalate, it is necessary to step back and look at the structure, history, and recent reform of the Act itself.

The Architecture of the Act

The Succession Law Reform Act (“SLRA”) is Ontario’s foundational statute governing the distribution of property on death. Enacted in 1977, it consolidated and modernized earlier legislation dealing with wills, intestacy, dependants’ relief, and testamentary designations. It sits alongside the Estates Act^[2] and the Trustee Act^[3], but it is the SLRA that answers the core questions: who inherits, in what proportions, and under what conditions.

At its heart, the Act performs four essential functions.

First, it governs the formal validity of wills. It sets out the requirements for execution, witnessing, and revocation. It addresses holograph wills and defines when a document can be treated as testamentary.

Second, it creates the rules of intestate succession. When a person dies without a valid will, the SLRA determines how the estate is divided among a surviving spouse, children, and more remote relatives. The statute prescribes preferential shares, residue allocations, and substitutional gifts to issue.

Third, it addresses the rights of dependants. Part V of the Act allows certain dependants, including spouses, children, and others who were being supported, to seek support from the estate if adequate provision was not made.

Fourth, it regulates beneficiary designations in respect of insurance, pensions, and similar plans.

In short, the SLRA reflects a balance between testamentary freedom and statutory fairness. It allows individuals to distribute their property as they see fit, but it imposes guardrails.

The grandmother’s will in the opening example engaged precisely that tension. If valid, it reflected her testamentary freedom. If procured by undue influence, it represented the subversion of that freedom.

A Brief Historical Perspective

The SLRA was enacted during a period of modernization of Ontario’s estates regime. It replaced older, fragmented statutes with a unified framework. The Act codified principles that had developed in the common law, particularly in relation to dependants’ relief and spousal entitlements.

For decades, certain assumptions remained fixed. Marriage automatically revoked a will. Separated spouses could still benefit unless formally divorced. Virtual execution of wills was unthinkable. Beneficiary designations were tightly constrained.

That stability ended in the early 2020s.

The End of Automatic Revocation by Marriage

One of the most significant reforms came through the Accelerating Access to Justice Act, 2021^[4]. Effective January 1, 2022, marriage no longer automatically revokes a will.

For generations, the rule was simple. If you married after making a will, the will was revoked unless made in contemplation of that marriage. The rationale was protective with the message that marriage fundamentally altered a person’s obligations and relationships.

The Legislature concluded that the rule created more harm than protection^[5]. It could be exploited in predatory marriage situations, and it often produced unintended intestacies. The repeal shifted the emphasis back to individual responsibility. A will now survives marriage unless expressly revoked.

For estate litigators, this change has altered the landscape. Old wills that once would have been wiped away now remain operative. That fact alone can reshape disputes.

Separated Spouses and Testamentary Consequences

The same reform legislation addressed another longstanding tension, namely the status of separated spouses.

Historically, unless divorced, a separated spouse could still inherit under a will or on intestacy. That often produced results inconsistent with lived reality.

The amendments now treat certain separated spouses similarly to divorced spouses for inheritance purposes, provided statutory criteria are met, including prolonged separation. This reform recognizes that marital status in law does not always reflect marital status in fact.

The practical effect is significant. Estates that once would have flowed to a legally married but long-estranged spouse may now pass elsewhere. That shift reduces some disputes but has the potential to generate others, particularly where separation dates are contested.

Virtual Execution and Modernization

The pandemic accelerated modernization. What began as emergency measures allowing remote witnessing of wills became permanent. Audio-visual execution is now recognized, provided statutory safeguards are observed^[6].

This reform acknowledged technological reality. But it also introduced new evidentiary considerations. Questions of capacity and undue influence may now arise in a virtual setting, with recordings and remote witnesses forming part of the factual matrix.

Beneficiary Designations and Incapacity Planning

More recently, amendments have clarified the ability of attorneys under continuing powers of attorney for property and guardians to make certain beneficiary designations in limited circumstances, particularly where a plan is converted or replaced but the beneficiary remains unchanged^[7].

This technical adjustment reflects the growing intersection between incapacity planning and estate planning. It reduces the risk that administrative changes to financial products inadvertently defeat longstanding estate intentions.

Undue Influence and the Limits of Testamentary Freedom

Returning to the grandmother’s will, the legal issue was not whether she had the right to favour one child. She did. The question was whether the will reflected her true intention.

Undue influence is not lightly found. I wrote a recent blog on the issue, “Pulling the Strings: Proving Undue Influence in Canadian Estate Litigation”.^[8] The law presumes capacity and respects autonomy. But where evidence suggests coercion, domination, or manipulation, particularly in circumstances of vulnerability, courts will intervene.

From my seat, these cases are fact-intensive, emotionally charged, and expensive to litigate. Allegations of pressure within families cut deeply. The legal framework provides tools, but it does not heal relationships.

Why Mediation Matters

Estate disputes under the SLRA are rarely just about money. They are about history, perceived fairness, sibling rivalry, and unresolved grievances.

Litigation provides structure and authority. But it also entrenches positions. It forces family members into adversarial roles and can permanently fracture relationships.

Mediation offers something different. It allows parties to speak directly. It creates space for explanation and acknowledgment. It permits creative solutions that courts cannot order, including structured payouts, property divisions, apologies, or agreements that preserve dignity on all sides.

In cases alleging undue influence, mediation can be particularly effective. Even where the legal merits are contested, parties often recognize the uncertainty, cost, and emotional toll of trial. A mediated resolution allows them to control the outcome rather than surrender it to a judge.

The Succession Law Reform Act provides the legal framework. It sets the rules. But it does not dictate how families must resolve their disputes. That choice remains theirs.

As estates become more complex and families more diverse, disputes under the SLRA will continue. Understanding the basics of the Act, its history, structure, and recent reforms is essential. So too is recognizing that while the statute governs succession, mediation often creates resolution.

This blog is provided for informational purposes only and does not constitute legal advice.