All presidents bar one are directly descended from a medieval English king

What do Barack Obama, Thomas Jefferson, George W. Bush and the other past U.S. presidents have in common? Besides holding the coveted title of commander-in-chief, it appears that all of them but one are cousins.  

The remarkable discovery was made by 12-year-old BridgeAnne d’Avignon, of Salinas, California, who created a ground-breaking family tree that connected 42 of 43 U.S. presidents to one common, and rather unexpected, ancestor: King John of England.

‘They all have the trait of wanting power,’ d’Avignon told the station WFMY.