Regardless of whether blood is thicker than water, America may soon get a chance to see whether it’s thicker than politics.

The Donald and Hillary are 19th cousins, according to genealogy experts.

According to a report in Extra TV, genealogy experts say Donald Trump and Hillary Rodham Clinton — the front-runners for the Republican and Democratic presidential nomination — share a common ancestor from England 18 generations ago.

Citing MyHeritage.com’s genealogy site Geni.com, the common ancestors are John of Gaunt, the duke of Lancaster, and third wife Katherine Swynford at the end of the 14th century — a century before Columbus sailed the ocean blue.

One of their children was Joan Beaufort, whose descendants include Mrs. Clinton. Her brother John Beaufort is an ancestor of Mr. Trump. Their descendants included several kings of England and centuries of Scottish kings.

“Their 19th great grandfather is King Edward III [John’s father] so there is precedent for ruling a country, it’s in their genes,” A.J. Jacobs, who teamed up with MyHeritage.com and studied the research done by Geni, told Extra TV.