Yes, the bretons are halfies, with aldmer and nedic blood. However, that took centuries of closed environment breeding between the aldmer and nedics.
And honestly, I doubt it had much to do with blood and racial inheritance anyways. That's just not how the world of Nirn works, fundamentally. It's a universe where mythopoeic thought takes literal form. Their alteration came about from mythical and ideological impressing or somesuch. Know what I'm saying?