Wait, how old is Ein again? At least ten, isn't he? Damn, if he did have a sister, she'll have to learn to be an enterprising munchkin to have some fun. Not that he wouldn't teach her his tricks, but she'd have to come up with her own set of tricks to get around him. Would she also have to undergo their 'special' training? Besides poison, would her education in other areas be equally rigorous? What if it's a little brother?