Board Thread:Lore Discussion/@comment-85.74.137.231-20130605091958/@comment-1407576-20130803093944

Also, I think there is a failure in logic here with the original post.

"If the dragonborns are the desendants of the timber septin (a.k.a. The royal family) then how can every race have dragonborn?"

The last member of the royal family was Martin Septim, and he didn't have any children. So, according to the logic that some appear to be following (that being dragonborn must be inherited), not even humans could be dragonborn anymore.