Updated: Nov 16, 2020
Blood is blood. We are not all blood. Even if your sorta-uncle is there more than your real one. Genealogy is really pro blood connections. Adoptions are harder to adopt but can be done.
Here are a video and a quick image to help you define your connections.
When you get to larger trees, you start to realize areas were small, and so were populations, so we may all be cousins, especially once you’re in a SIG (Special Interest Group).