Um I believe they are a Count family not a Duke one but I mean, it sounds better!

But mostly duke/duchess is of royal blood. This is confusing accdg to the story. Countess is pretty much below the pyramid and the difference is huge.

Yeah Lucia here! I'm sorry my korean isn't good and I kind of got lost along the way. Priscilla is actually a countess and 2 ranks below a duchess. Sorry for the misunderstanding!

Its ok!