I read this long ago, but I clearly remember only the brother and the ml were related to each other. The fl is from the emperor and the empress so she’s pure blue; she does not share an ounce of blood with the ml. Her brother, on the other hand, is from the empress and i believe mls father. The ml is from his own mom and dad (i can’t remember if he was a duke or whatever). It’s confusing lol, but ml + brother have the same dad. Fl is strictly from the empress and emperor. Something could be reversed but the whole point I’m making is that ml and brother share a parent, either a dad or mom which I’ve forgotten (I believe it’s mom because as far as I remember I think the emperor disliked the fls brother for the sole reason he was not from his blood)
Guys, if yall really look at the story and the family dynamics, THEY ARE ALL RELATED like Regef's father had an affair with the empress since they are lovers while being in a marriage with Raffaello's mother and so THEY ARE SIBLINGS