The Longest Lineage of a Family Tree

I would love to see a program done on Japan's emperor you know the imperial family in Japan because they have a family tree that's traced back so far that it goes into mythological characters. Steve Mangans is really funny because they found out that all of his ancestors were from the same place in Ireland at the same very small place in Ireland. He's yeah his mother and father grew up in adjacent villages on the west coast of Ireland but they never met until they both happened to come to London and then meet each other there. I think that's so interesting that your whole family can be from one tiny spot. And there's also the Guinness Book of World Records actually acknowledges the longest lineage