I wonder what the evidence is. I didn't see any actual documentary sources on the Geni.com profile. I'm not in anyway saying that Alexander & Jean aren't Samuel's parents, I just always want more proof. It looks like there are two profiles for Samuel married to Martha Keys Buchanan. The other is Samuel Buchanan-1282. I would try to get proof of where Samuel was born and his marriage to Martha Keys before I would try to link another generation. Maybe the managers of those profiles have information that is not entered into WikiTree yet.