they all have blood that allows them to activate dragon veins tho. hinting that they all have a bit of dragon in them I assume.
both royal families are descended from a first dragon (the same on in fact) so they all have traces of dragon blood, their not as pure as Kamui though, which is why he/she can use a dragonstone.
both royal families are descended from a first dragon (the same on in fact) so they all have traces of dragon blood, their not as pure as Kamui though, which is why he/she can use a dragonstone.
Actually, the Nohrian royal family is descended from the Dusk Dragon, while the Hoshidan royals are descended from the Dawn Dragon.