It was. On the show, which premieres Friday on PBS, series host Henry Louis Gates Jr. told both men that their DNA tests revealed they both had more than 97 percent Ashkenazi Jewish ancestry, Variety reported.

We are related?! Yes, it's true. Watch U.S. Senator Bernie Sanders and #LarryDavid find out they are related on tonight's Season 4 premiere of #FindingYourRoots with Henry Louis Gates, Jr. Watch the full episode: http://bit.ly/TheImpression Posted by Finding Your Roots on Tuesday, October 3, 2017

Gates and his researchers were able to determine that the family of David’s mother came from the former Austro-Hungarian Empire, with his grandparents having been born in the city of Tarnopol, Poland. In addition to information about David’s grandparents, Gates and his team also uncovered that David’s mother was also born in Poland, Variety reported.

Sanders learned that his family also had roots in the Austro-Hungarian Empire, in a region known as Galicia, Variety reported. After World War I, Sanders’ relatives lived in what became part of what is now Poland. Most of the relatives of Sanders’ father remained in Europe and were killed by the Nazis during World War II, Variety reported. Sanders’ uncle was put to death for refusing to hand over a group of Jewish resistors.

Although it was supposed to be kept secret until the season premiere, David leaked the news that he was distantly related to Sanders over the summer, Mediaite reported.