Someone from his birth family will certainly show up as a cousin or even a sibling! I was adopted and actually found my father via Ancestry. Sadly, he was murdered when I was 4, but I have "met" some of his relatives. He was easy because of his ethnicity. My bio mother is much tougher because she's a Euromutt. But I've had a couple first cousin hits from her side. No one has responded to my attempts to reach out. That's okay. I'm fine either way.