Spousal Trusts in Blended Family Estate Planning: Protecting Spouse and Children

If you're in a second marriage or a blended family, a plain "everything to my spouse" will can create a problem you may not intend: once your spouse inherits everything outright, nothing legally requires them to leave anything to your children from an earlier relationship. A spousal trust is one of the more common tools Ontario testators use to solve this — providing for a current spouse without giving up control over where the assets ultimately end up.

Here's how the structure generally works, and what it does and doesn't guarantee.

The Blended-Family Problem a Spousal Trust Solves

When you leave assets outright to a spouse, those assets become theirs to do with as they choose, including rewriting their own will later to leave everything to their own children, a new partner, or someone else entirely. For blended families, that can mean your biological or adopted children end up with nothing, even though you fully intended for them to eventually inherit. A spousal trust breaks that chain by separating "who benefits now" from "who ultimately owns the capital."

How the Structure Generally Works

Rather than transferring assets to your spouse outright, your will directs them into a trust. Your spouse generally receives the income the trust generates for as long as they live — and, depending on how the trust is drafted, may also be given the right to use specific property, such as continuing to live in the family home. The capital itself, however, stays inside the trust under the terms you set. When your spouse's interest ends (typically on their death), whatever remains in the trust passes to the beneficiaries you named — usually your children — rather than being redirected by your spouse's own will.

What the Surviving Spouse Can and Cannot Do

• [ ] Can generally receive all of the trust's income for as long as they live
• [ ] Can often be given the right to live in, or otherwise use, a specific property like the family home, if the trust is drafted that way
• [ ] Cannot redirect the trust's remaining capital to their own children, a new spouse, or anyone else through their own will
• [ ] Cannot unilaterally collapse the trust and take the capital for themselves, unless the trust document specifically grants that power
• [ ] May have restricted access to the capital itself, beyond the income it produces, depending on how the trust is drafted

Common Structures Used in Blended Families

• A trust holding investments and savings, with income paid to the spouse and capital ultimately passing to the children from an earlier relationship
• A right for the spouse to reside in the family home for their lifetime, with the property itself passing to the children afterward
• Life insurance proceeds directed to the spouse outright, alongside a separate spousal trust for other assets, so the spouse has liquid funds without competing directly with the children's eventual inheritance

Where Disputes Tend to Arise

Because a spousal trust puts a surviving spouse and a testator's children on opposite ends of the same asset — one benefiting now, the others benefiting later — friction is common even with careful drafting. Disagreements often centre on how the trustee manages or spends on behalf of the property (particularly a home the spouse lives in), or on whether the trustee is treating the spouse's current needs and the children's future interest even-handedly. Naming a neutral, capable trustee, and being specific in the trust document about maintenance, expenses, and decision-making, reduces the risk of these disputes later.

Getting the Drafting Right the First Time

Blended-family spousal trusts are not a place for a generic template. The document needs to clearly define what the spouse is entitled to, what happens to specific property like the home, who the ultimate beneficiaries are, and how a trustee should balance competing interests — all while meeting the technical tax conditions that let the arrangement qualify for capital gains deferral in the first place.

Frequently asked questions