Bubba is one of my DNA matches.
Tommy is also one of my DNA matches.
When I look at my shared matches, Tommy is a match that Bubba and I share. That does not necessarily mean that Bubba, Tommy, and I have the same family in common. It means that Bubba and Tommy share DNA, Tommy and I share DNA, and that Bubba and I share DNA. We may all come from the same family.
Or we may not.
- Bubba and I could descend from our common ancestor, Samuel Neill.
- Bubba and Tommy could descend from a different ancestor–called Ancestor A in the illustration.
- Tommy and I could descend from yet a different ancestor–called ancestor B in the illustration.
Shared DNA matches are a clue. Remember what they tell you–and what they do not.