@poweranimals said:

Just watched the Iron Sisters episode where they were scanning for demon blood. Didn't they reveal early on that Shadowhunters had half angel half demon blood? Or am I remembering wrong?

In the books they are half angel/half human. The show and books are pretty much a mess in my head right now so will have to watch that episode again.

Shadowhunters are Human/Angel. Seelies are Angel/Demon.