Somewhere I saw a chart that showed the relationships of all the USA Presidents. They were all related except for one or two. Another source stated that most could all be traced back to European Royalty.
I saw that as well. Wish my old brain could remember. I used to watch a lot of You Tube vids.
http://www.atlanteanconspiracy.com/2008/06/presidential-bloodlines.html
This blog talks about Presidents being related.
Virginia down can often trace royal. North not as much. The southern colonies were more likely to start out from royal grants. Easy to be related to the Bush clan if you carry NY genes. 7th cousin here. They relate to the Roosevelts because they’re another NY line. 7th cousin here. But I don’t know how they connect to people originating in other areas like Lincoln and Taft, etc.
http://familypedia.wikia.com/wiki/Genealogical_relationships_of_Presidents_of_the_United_States