Unlikely = There is something in the family tree going up to the common ancestor that I disagree with. There might be another path to a common ancestor; however, according to my research, the path “We’re Related” is suggesting is not possible.
Possible = “We’re Related” has added additional ancestors to my tree to reach a potential common ancestor. I need to do more research to agree with the Common Ancestor.
Probable = “We’re Related” indicates a common ancestor that I agree is an ancestor of mine. I need to research the descendants of that ancestor to assure the connection.
Certain = Well as certain as you can get in Genealogy. “We’re Related” indicates a pathway up to a common ancestor and down to the famous person that I am in agreement with.