I am assuming that they switched at some point, maybe around the time that he went to war? Because the FL kept noticing the portraits of them were different from what they looked like.
I've been comparing screenshots for the last half hour and I think we've never seen the brother in person. their faces are p much the same but he has a harder jaw and no part in his hair (it could have just been styled like that for the portrait) while Anna and the marquess we've met don't have the same hard angle in the jaw and the hair is always parted in the same place as Anna
oooooo, they're the same person?! That's interesting as well. But I wonder how the letters and them "arriving" during the same day would work. This is getting cooler~
Wait a minute. He is a she? Or was that actually Anna the whole time? I'M SO CONFUSED!