Alec has never called Jace his ‘brother’ before… Based on the S2 trailers!
“You called Jace your brother,” Izzy says softly as she sits down on the edge of her brother’s bed and crosses her legs.
Alec, who’s lying fully dressed on the covers with his right arm thrown over his eyes, doesn’t look at her. “So?”
“You have never done that before,” she observes. “You’ve always called him your best friend or your parabatai but never your brother.”
This my shipper heart can totally live with… And I love Izzy so much.