By Elena Vasquez

A claim to Canadian citizenship by descent runs through a chain of parent-child links, and an immigration officer must test every link in that chain. If your claim reaches back through a grandparent, great-grandparent, or an older relative, the officer follows the line one generation at a time.

For each parent and child in the line, the officer asks a single question: is the family link more likely than not to be real? That evidentiary bar carries a formal name — the balance of probabilities. It is a civil standard, not the criminal one.

What does the officer actually decide?

The decision is not a single yes-or-no on your citizenship. Instead, the officer breaks your family tree into separate parent-child pairs and evaluates each pair on its own.

That structure matters. A strong document for one generation does not automatically carry the generations above it. Each link — from you to your parent, from that parent to theirs, and onward — must stand on its own evidence.

The takeaway: a descent claim is only as strong as its weakest parent-child link.

What standard of proof applies?

The balance of probabilities means the officer finds the relationship more likely true than not. The source frames the test plainly: for each parent and child in your line, the officer decides whether the link is "more likely than not" to be real.

This is a lower bar than "beyond a reasonable doubt." It asks for probability, not certainty. Still, the officer applies it fresh at every generation, so an old or poorly documented link can become the point where a claim fails.

The takeaway: each generation must independently pass the same "more likely than not" test.

Who does this affect?

The process applies to people whose route to Canadian citizenship depends on descent through older relatives — a grandparent, a great-grandparent, or someone further back. Their file will be read generation by generation, pair by pair.

Claims resting on a single parent born in Canada face one evaluation. Claims reaching back two, three, or more generations face a stack of them, and the officer must clear every one before citizenship follows.

The takeaway: the further back your line goes, the more separate proof points the officer must accept.

Where the rule comes from

Citizenship decisions by descent are made under Canada's citizenship framework, and this evaluation method — the generation-by-generation application of the balance of probabilities — is how officers apply it in practice. The full official guidance sits with Immigration, Refugees and Citizenship Canada, which remains the authoritative reference for how proof-of-citizenship files are assessed.

Anyone weighing a descent claim should consult the official IRCC guidance or a licensed professional for their specific file, since outcomes turn on the documents tied to each individual family link.