The Supreme Court just narrowed the field for trans athletes in America. Some of those families are already Canadian citizens

On June 30, the US Supreme Court upheld state bans on transgender student athletes playing girls' and women's sports. The 6-3 decision in West Virginia v. B.P.J. and Little v. Hecox kept laws in West Virginia and Idaho intact and strengthened similar ones in more than two dozen states.

The ruling further capped a run of rulings on gender-affirming care, military service, and passport gender markers that have narrowed the ground under trans Americans over the last few months.

If you're the parent of a trans kid in one of those states, the ruling lands as a practical question: What options does my family have now?

A potentially life-altering pathway that few families know about may sit in a filing cabinet, on a document nobody has read in decades.

Get a Free Consultation on Applying for Proof of Canadian Citizenship

Somewhere in that paperwork, for a lot of American families, is a Canadian ancestor. And a Canadian ancestor, under a law that changed in December, can mean the whole family already holds a claim to Canadian citizenship.

Canada differs by a significant degree when it comes to the inclusion of transgender persons—both generally and in specific activities, such as sport.

Gender identity and expression are protected grounds in human rights law in every Canadian province. U Sports, which governs university athletics, lets athletes compete by gender identity. Many provincial school sport associations keep inclusion policies.

However, the deeper value of pursuing Canadian citizenship has little to do with sports.

A second passport buys the ability to choose—many Americans applying for their Canadian passport have no intention of making the move. For a parent whose home state keeps passing laws against their child, that knowledge carries weight on its own.

Why so many Americans now qualify for Canadian citizenship

The law that opened this up is Bill C-3, which took effect in December 2025. It removed the old generational limit on citizenship by descent, the rule that used to cut off inherited citizenship after one generation born outside Canada.

Citizenship by descent means citizenship you inherit through an ancestor rather than earn through living in the country. Trace an unbroken line to a Canadian-born ancestor, and if you were born before December 15, 2025, you have a claim, however many generations back that ancestor sits. No language test. No residency requirement, no exam.

You don't apply to become Canadian. If you qualify, you already are, and you apply for the certificate that proves it.

How to find out if you have a Canadian ancestor in your lineage

The paradox of Canada’s new citizenship by descent laws at scale is that the number of people who apply is greatly dwarfed by the number of people who are eligible. This is largely due to the fact that many people (particularly Americans) are unaware of their eligibility.

The clues hide in surnames and geography. Anglicized French names run across much of America, Roy softened to King, La Rivière to Rivers. This is to say nothing of dit names, which typically dropped their French half in favor of even greater modification for the English-speaking population.

Maine has the highest share of French ancestry of any US state, close to one in five people, and nearer to one in three in some northern counties. Their great-grandparents came down from Quebec between 1840 and 1930, almost 900,000 of them, to work the textile mills. They built parishes and French newspapers in the neighborhoods they called Little Canadas.

However, Canadian heritage can likely be found all over the United States. Some Cajun families in Louisiana carry a name worn down from "Acadian," and descend from Canadians the British expelled from Nova Scotia in 1755. Canadian roots run deep through Michigan, Minnesota, and Wisconsin. A grandmother who "came from up north", a branch of the family tree nobody can place—those are the threads worth pulling.

The arithmetic is what makes the search worthwhile. Trace one ancestor, and you potentially find a claim for your siblings, your cousins, and their children at the same time. The genealogical work happens once and carries across the whole family. One person in Lewiston opening a filing cabinet can put a passport within reach of a nephew in Denver and a grandchild in Boise.

On applying

Gathering birth and marriage certificates across generations is the real work for a citizenship by descent application, and it's where an immigration lawyer can be useful. One mismatch between a baptismal record and a birth certificate can stall an application for months.

The wait is not trivial: while gathering the needed documents to aid your claim can be swift, application processing can take a significant amount of time. A proof of citizenship application takes about 19 months to process at the time of writing, though Canada's citizenship department can expedite a file when the circumstances warrant it.

You can find more information on applying for citizenship by descent in our dedicated article on the topic.

The door has been there the whole time, folded into a name the family stopped pronouncing the French way three generations back. For anyone now asking where their kid can grow up as themselves, the first step is finding out whether you already hold the key.

You can check where your family stands with CanadaVisa's free citizenship by descent eligibility checker.

Get a Free Consultation on Applying for Proof of Canadian Citizenship