According to 23andme, I'm related to Louis XVI! Any other royals here?

[Tintweezl]

11. Yeah, but....

The average MRCA (most recent common ancestor) of any haplogroup, maternal or paternal, is 9500 years.

This means that in 7,500 B.C., a caveman and cavewoman had a cavebaby who had a mutation in Y DNA or mtDNA that became the founder effect for a new haplogroup that went on, over the course of 40,000 generations to eventually produce you and, on a totally separate pedigree, one of the royals. Any remnant of this shared ancestor DNA-wise would be less than 1cm or 0.0000001%. The odds that you and the royal inherited that same fraction of DNA is that number squared by itself, or 0.0000001% of 0.0000001% and even if you did, 1cm is not enough to even register as a match on any autosomal site because everybody has 1cm that matches everyone else just based on randomness.

It’s a cute marketing ploy by the DNA sites but meaningless as to “related to” a royal. It means you are 40,000th cousins many times removed just as everyone is to everyone else.