[@Mokley] Correct, he doesn't know he's a Howl yet but has some suspicions as of late because of how much more frequently he's seeing things and feels a heat in his hands that's not really there. The power that he'll develop is being able to identify the Rue as well as use an arcanic fire ability that can't be seen on this plane, but absolutely tears through them in theirs, if that makes sense.

I figured the little sister (only a year younger than him) to be just more background information. Though if she works for some kind of plot I'm okay with you using her. I just wasn't planning on it.

As for their mother, I had it in my head that she was killed by the Rue - she was a Howl and a damn good one but just wasn't quick or prepared enough one day. Maybe for whatever reason the government is trying to hide the real reason? Or maybe they don't make Rue deaths super public to prevent fear?