when does jace find out he's not clary's brother book
City of Glass (Clare novel) It is during this time that Clary discovers, after talking with her mother (who had finally awoken from the spell that Magnus used from the spell book) that she had received angelâ€™s blood while in the womb. She also learns that Jace is actually the son of Stephen Herondale, grandson of the last Inquisitor, and Jace had also received angel's blood while he was in his mother's womb. This means that Jace and Clary are not siblings and Jace does not have demon blood, but rather more angel's blood, and further reveals that Sebastian is actually the one with demon's blood and Clary's brother.