Just to add a bit more because I researched this idea a bit more because I was curious.

There's an blood quantum protocol for the indigenous peoples of America where if you possess a certain amount of Native American ancestry you are eligible to be accepted into the community (and live on their land) - for some tribes it is not a high requirement at all: could be a great-great grandparent or something. Just a (relatively) recent traceable ancestor - what is important to them is that you begin to identify with the culture and tradition, and not just with the blood.

Anyway, it's a little strange to me, but at the same time I think it's kind that these people would welcome anyone of their blood, even if it is distant, who takes enough interest to know their culture and roots.