[He can guess why that is, so he won't comment on it. Instead he'll say something else.]

Dad was a total hardass. He never treated us poorly or anything, but he pushed us to work hard every day. I think that was his way of showing that he cared, by making sure me and Yukio were ready to be adults.

Guys like Dad and your master, I think feelings are tough for them. I don't think Dad had much of a family to show him how to be a parent, I've never met his family. Maybe it's the same for your master?