Saw a post saying that every president (except VanBuren) was in one way related to king John. How true is this? | AskHistorians Archive Observer

Saw a post saying that every president (except VanBuren) was in one way related to king John. How true is this?

by bruingrad84

http://didyouknowblog.com/post/128875819676/before-this-historians-could-only-link-22-of-the

Searocksandtrees

hi! a similar question came in a few weeks ago. TL;DR: probably true, but it's not remarkable.

According to the link in the description, Barrack Obama is technically related to King John of England, including a number of other presidents is there any truth to this?