Fertility and Donor Agreements in Ontario: Protecting Your Legal Parentage

Assisted reproduction has made parenthood possible for thousands of Ontario families who couldn't conceive without help. But the legal side of donor conception — particularly with known donors — is more complicated than most people realize. A single document, drafted before conception, can mean the difference between a donor who stays a donor and one who ends up with legal parental rights and obligations neither party intended. This guide explains how donor agreements and legal parentage work under Ontario law.

The Fundamental Rule Under Ontario's CLRA

Ontario's Children's Law Reform Act (CLRA) was updated to address assisted reproduction directly. The key principle: a person who donates sperm or eggs is not a legal parent — provided there is a valid written pre-conception agreement in place before conception that designates them as a donor.

Without that agreement, the default parentage rules can produce unexpected results:

• A known sperm donor who has no agreement and whose identity is later established may be found to be a legal parent.
• If the donor has a spouse or partner, and conception occurred within the presumption windows, that spouse/partner could also be drawn into a parentage analysis.

The pre-conception agreement is the mechanism Ontario law specifically created to prevent these outcomes.

Known Donors vs. Anonymous Donors

Anonymous donors through a clinic

When sperm or eggs are obtained from an anonymous donor through a licensed fertility clinic, there is no practical risk of the donor asserting (or being forced into) legal parentage. The clinical process produces documentation that removes any ambiguity.

Known donors — the higher-risk scenario

Using a friend, family member, or someone found through a personal network as a donor creates much more legal complexity. Known donors are real people whose identities are known to the child and the family, and the nature of their relationship with the intended parent(s) can blur into territory that courts may scrutinize.

Key risks with an undocumented known-donor arrangement:

• The donor could later seek a declaration of parentage and parenting time or decision-making responsibility
• If the intended parent cannot support the child, the donor may be pursued for child support
• The child may inherit from the donor under intestacy law
• The donor's family members may claim a relationship with the child

A written pre-conception agreement signed before conception — with each party having independent legal advice — is the primary protection against all of these outcomes.

What a Donor Agreement Should Say

A well-drafted pre-conception agreement for a known donor arrangement typically addresses:

1. The donor's role: Clear statement that the donor is contributing genetic material only and does not intend to be a legal parent.
2. The intended parent(s)' role: Identification of who will be the legal parent(s) — which can be a single parent, a couple, or (under Ontario's updated rules) up to four intended parents.
3. No parenting rights or obligations: Explicit agreement that the donor will not seek parenting time, decision-making responsibility, or any other parental rights.
4. No child support: Agreement that the donor will not be obligated to pay child support (though courts retain some jurisdiction over child support regardless of private agreements).
5. Disclosure: Whether and how the donor's identity may be disclosed to the child, and any conditions around contact.
6. Future changes: What happens if the intended parent dies, becomes incapacitated, or the family situation changes.
7. Clinic consent forms: The agreement should align with any clinic consents the donor signs, but the legal agreement is a separate document.

Independent legal advice for each party

Both the donor and the intended parent(s) should obtain independent legal advice before signing. An agreement where only one side had a lawyer may be challenged later as not truly informed consent.

Egg Donors and Intended Mothers

Egg donation has its own parentage dimension. Under Ontario's CLRA:

• The person who gives birth is always a legal parent (subject to a surrogacy pre-conception agreement — see our surrogacy article).
• An egg donor who does not carry the pregnancy is not automatically a legal parent.
• But if an egg donor is also the gestational carrier (i.e., she carried the child conceived from her own egg), the analysis becomes more complex and surrogacy rules apply.

For most egg donation arrangements through clinics — where the intended mother or a surrogate carries an embryo created from the donor's egg — the donor's genetic contribution does not create legal parentage, especially with proper clinic documentation and a pre-conception agreement.

What Happens If There's No Agreement?

Courts in Ontario have grappled with cases where no written pre-conception agreement existed. The results have varied depending on the facts:

• In some cases, courts have found the donor to be a legal parent based on evidence of the parties' original intentions and subsequent conduct.
• In others, the "genetic material only" understanding was upheld based on circumstantial evidence.
• The uncertainty of litigating these cases — in terms of cost, emotional toll, and unpredictable outcome — underscores why a proper agreement before conception is far preferable to relying on reconstructed evidence after the fact.

Frequently asked questions