It was not until amateur genealogist and Burleigh family friend Roger Mitchell traced Mr Stubbs that the brother and sister knew the other was still alive.
Recognizing this intersection of online tools with the old-fashioned world of ancestry exploration, MacEntee sensed that he could profit from this changing dynamic by becoming a professional genealogist specializing in technology and social media.
British genealogist Anthony Adolph, who was tasked by the Illinois Office of Tourism to find Lincoln connections in Britain, said he was surprised by the number of people who believe they are related to the US president.