They are the ones that have the Faerie bloodline, right?
The race of Shadowhunters have the blood of an Angel (Raziel), but the family Blackthorn also has some Faerie blood due to the union of Arthur Blackthorn and an unnamed Faerie (resulting in the birth of Mark and Helen Blackthorn).
I've been researching info on The Dark Artifices series that is coming out soon...I really enjoy The Mortal Instruments and The Infernal Devices (though I am waiting to get the last few books in paperback) ^^
Well, to answer the first: My Blackthorn characters have been around for quite a bit longer than the Shadowhunter Blackthorns...and they are certainly no angels.
And I could see Valentine being more than a little bigoted toward them...but at least they didn't have Demon Pox ^^
I should've known, just from reading Scarlett's bio, that they weren't Nephilim. First of all, an iratze could've easily fixed Scarlett's eyes. Second of all, the bio said that Gabriel killed their father, and as Jace once said, "A Shadowhunter who kills another of his brothers is worse than a demon and should be put down like one."
But, you didn't answer my other question: Did you see the movie?