When a child is born, the parent has to get them registered at the local council office. And then when my first card was made at 18, my dad went with me as verification, he attested that I was child #X as per the family tree, they confirmed someone with my name was in that family tree in their records, and used that as verification for me.
If parents are not available they can use relatives, as long as there is a family tree link. Not sure how they do it otherwise, but there is some system for refugees etc too.
iirc, they use other people as verification.
When a child is born, the parent has to get them registered at the local council office. And then when my first card was made at 18, my dad went with me as verification, he attested that I was child #X as per the family tree, they confirmed someone with my name was in that family tree in their records, and used that as verification for me.
If parents are not available they can use relatives, as long as there is a family tree link. Not sure how they do it otherwise, but there is some system for refugees etc too.