Canada is on the verge of a major change in citizenship law, and for many people with Canadian ancestry, this could mean an unprecedented opportunity to obtain Canadian citizenship not just through a parent or grandparent, but potentially through a great-grandparent or even earlier generations.

While Canada’s immigration process is built on documentation and credibility, there are times when the usual paperwork, like birth certificates, passports, or legal declarations, isn’t enough. If you’ve been asked to undergo DNA testing as part of your immigration journey, here’s what you need to know.