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Find a Lawyer » Canada Legal Guides » Ontario Legal Guides » Wills & Estate Planning Ontario » Setting Aside a Predatory Marriage to Protect an Ontario Inheritance

Setting Aside a Predatory Marriage to Protect an Ontario Inheritance

12 Jun 2026 4 min read No comments Wills & Estate Planning Ontario
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A predatory marriage occurs when an opportunist secretly marries a vulnerable senior to gain statutory rights to their estate. To protect your inheritance in Ontario, you must apply to the Superior Court of Justice to declare the marriage void ab initio (invalid from the start) by proving the senior lacked the mental capacity to marry.

As Ontario’s population ages, a disturbing trend known as “predatory marriages” has emerged across communities from Hamilton to Markham. This happens when a much younger caregiver, a new “friend,” or a neighbour secretly marries an elderly person who is suffering from Alzheimer’s or dementia. 🔍 The predator’s sole goal is to gain massive financial benefits upon the senior’s death.

While Ontario updated the Succession Law Reform Act (SLRA) in 2022 so that marriage no longer automatically revokes an existing Will, predators still pose a massive threat. A legally recognised spouse gains immense power, including the right to claim a massive share of the estate under the Family Law Act (equalization), claim dependent support, or inherit everything if the senior dies without a Will (intestacy). 💰 Adult children must act decisively through the court system to stop these bad actors.

Step-by-Step Process for Challenging a Predatory Marriage in Ontario

Fighting a predatory marriage involves a complex intersection of family law and estate litigation. You are essentially asking a judge to erase a marriage certificate as if the union never happened. 📝 Here is how families generally navigate this process at the Superior Court of Justice.

Step 1: File an Urgent Injunction to Freeze Assets

Predators move quickly to drain joint bank accounts or put their names on the title of the senior’s home. Your estate lawyer should immediately file an urgent motion for a Certificate of Pending Litigation (CPL) to freeze the real estate, and an injunction to freeze all bank accounts. 🚨 This prevents the predator from running away with the assets while the court case is ongoing.

Step 2: Object to the Predator Becoming Executor

If the senior has passed away, the predator spouse might rush to the courthouse to apply to be the Estate Trustee (executor). You must file a Form 74.44 Notice of Objection at the local Superior Court of Justice to block them. 📄 Allowing a predator to take control of the estate administration is a disaster that must be prevented.

Step 3: Gather Medical Evidence of Incapacity

The legal test to invalidate a marriage in Ontario is proving the senior did not understand the nature of the marriage contract or its responsibilities. You must secure comprehensive medical records, doctors’ notes, and capacity assessments from the time the marriage occurred. 🏥 If you can prove your parent had advanced dementia and did not even know what year it was, the court is highly likely to void the marriage.

Step 4: Pursue an Application for a Declaration of Invalidity

Your lawyer will formally ask the court to declare the marriage “void ab initio” (invalid from the beginning). If successful, the predator loses all spousal rights. They cannot claim the preferential share under intestacy rules, and they cannot claim a division of property under the Ontario Family Law Act. 👨‍⚔️

How Much Does it Cost in Ontario?

Litigating a predatory marriage is incredibly complex because it involves medical experts and high-stakes asset freezing. It is a significant financial investment to protect the family legacy. 💵

Legal ActionEstimated Cost in CAD (2026)
Urgent Court Injunctions (Asset Freezing)$10,000 to $20,000+ immediately
Retrospective Capacity Assessment (Medical Expert)$3,000 to $7,000 per report
Notice of Objection Filing Fee$0 to file the initial objection form
Full Trial for Declaration of Invalidity$75,000 to $150,000+

Because predatory spouses are highly manipulative, you should instantly consult an experienced Ontario estate litigation lawyer from our directory. Do not attempt to confront the predator without legal representation.

How Long Does the Process Take?

Securing an emergency injunction to freeze the bank accounts can happen within 24 to 48 hours if the threat is imminent. However, voiding the marriage itself takes much longer. Collecting medical records, questioning the predator under oath during Discoveries, and waiting for a trial date at the Superior Court of Justice usually takes 2 to 3 years. ⏱

Frequently Asked Questions (FAQ)

Does marriage automatically cancel an old Will in Ontario?

No. As of January 1, 2022, the Succession Law Reform Act was changed. Getting married no longer automatically revokes an existing Will in Ontario. However, the new spouse still gains massive statutory rights to claim money from the estate, making them dangerous.

What if the predator made my parent sign a new Will?

This is very common. If the predator dragged your parent to a new lawyer to sign a new Will leaving everything to them, you will have to challenge BOTH the validity of the marriage and the validity of the new Will on the grounds of undue influence and lack of capacity.

Can we stop the predatory spouse from controlling the funeral?

Legally, the Estate Trustee named in the Will has the right to manage the remains. If there is no Will, a legally recognised spouse has first priority. You may need an urgent court order to prevent the predator from making funeral arrangements against the family’s wishes.

Who pays the legal fees to fight the predator?

Initially, you will have to fund the litigation yourself. However, if the judge rules that the predator acted maliciously and fraudulently, the court can order the predator to pay your legal costs. In some cases, the judge may also allow your fees to be reimbursed from the estate assets.

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