Originally Posted by ANDY-J3
Alexander I and David I were brothers so they weren't your 27th and 28th great grandfathers.
You never know with those Royals though - they did get up to some curious things....
But, seriously, the information posted on those genealogy websites is only as good as the research done by the person who uploaded their family tree. There are of course quite a few people who are descended from Royalty, but a lot of genealogies showing links such as this are more works of fiction than fact. I have even seen family trees on websites like ancestry.com that go back to Adam and Eve.