Well the duke was evil and that's why he did that to his son because his father did that to him too, it's kinda like a cycle, he didn't learn how to become a real parent. I know one must say but still you're a parent you must feel something for your child, but when you're brought up in a house like that there's nothing you can really do. Luckily the FL is there and she isn't too late to change that. But yeah, I still don't support their ways on educating Ain, that's still child abuse.