Isabella thinks about this.
[Nathaniel?]
"Well, they're... not good," he says. "So when I was just a little kid and Micaiah was meeting Isabella for the first time, and she heard how not good his parents were, she went and looked them up to see if they had any more children, and she found me. And she thought they probably weren't being good to me either, so she brought me here to join the Eyrie children's choir to sing for the Gloria that year. And when I was talking to her after the Gloria, she opened a door and there was Milliways on the other side of it, so she took me in to show it to me."
"I just live at Cedar Hills - I tried to foster with Delilah here when I was little but the singing all the time even on through the night was unbearable; I was used to the quiet at Sinai or at least the bustle of Father's workshop. So, Cedar Hills. And I do - angel things." She shrugs. "Father thinks I must have an imagination somewhere but he's given up on finding it, I think."