After Skyrim i felt a little nostalgic and replayed Morrowind again when it occured to me that I don't know who are the ash vampires. Somehow i always believed that they were Dagoth Ur's brothers, because everyone in Morrowind sais it so. Even when they say they were his "generals", they add "his closest kin" to it, and really, what is a persons closest kin if not his siblings? Dagoth Endus introduces himself as the brother of Dagoth ur too.
Now you can say that calling them "brothers" is meant only in some symbolic way instead of biological (which seems to be a popular idea on this forum) but seriously, tI don't see any proof to this in Morrowind.
However, in the book "the Real Barenziah" they say that it is rare for an elven woman to have more than 2 children, and it is unheard of that they would have more than 3, which seems to pretty much contradict this claim.
Your thoughts?