When Larry David debuted his Bernie Sanders impersonation on Saturday Night Live, the similarities were uncanny. The Curb Your Enthusiasm star looked, talked and walked almost exactly like the Senator. David’s impression was so good that it was kind of scary. You didn’t know where David ended and Sanders began. When two appeared on the season 4 premiere of the PBS’ show Finding Your Roots they were given a shocking discovery: they are related.

Interviewing David and Sanders separately in the video below, Finding Your Roots host Henry Louis Gates, Jr. explains how guests’ DNA are compared and matched for similarities. In front of each guest was a book that would reveal his cousin.

“I hope it’s a good athlete,” said an excited David as he opened the book to find a photo of Sanders. “What the hell?!” he laughed.

Sanders opened his book and saw a photo of David. “You’re kidding! That is unbelievable!”

David was appreciative and said that having a “Cousin Bernie” was amazing. While Sanders said with a laugh, “He does a better Bernie Sanders than I do!”

This explains so much.