Board Thread:Oblivion/@comment-9716469-20130519212835/@comment-213.143.72.174-20130521140422

I agree with AzuraKnight, there is no evidence to support any kind of hereditary Dragon Blood. Dragonborn are "made," not simply born as a scion of a the former one. It's not that difficult to understand, really: Akatosh decides the world needs a new Dragonborn, he makes one - simple as that. Imagine the horror of having an entire dynasty of superpowered emperors and empresses... as if the Septim dynasty wasn't bloody enough without them Shouting each other to death. XD

Yes, I know, the objection about there being no dragons... but the Greybeards were willing enough to anoint both the Skyrim player and Tiber Septim as Ysmir, without there being any other need than simply to prove they were Dragonborn - which was done by quickly learning the Thu'um through the knowledge they provided. As such, any Septim could have become a master of the Thu'um, had they bothered to learn (quite a few lived in Skyrim as well).

Now imagine what someone like Queen Potema or Pelagius the 3rd would do to get such power. The fact that they didn't is evidence enough that all Septims being "of the Dragon blood" is nothing more but a fancy and void title.