Spoiler
were vampires until I had vampirism...
It shows when you play Dawnguard and this should be in the spoilers section of the forums.
It's only yesterday that I learned that Thadgeir was Dengeir's brother and Siddgeir's uncle (there is no clue about Thadgeir
being Siddgeir's father.).
I didn't notice until just know, how good a drawer Nelrick VonStabingston is.