User blog comment:Jimeee/Hearthfire confirmed as the latest add-on. Official trailer./@comment-108.46.155.40-20120830042734/@comment-3492791-20120830235235

Being Dragonborn is apperantly hereditary, since EVERY Septiem was a Dragonborn, and you are the last Dragonborn. So it was prophesied thousands of years ago that you would never get any...or maybe you're just a eunuch.