Same, the similar eye colors to her and hair color to her brother, really high chance he is their father, or even not, I'm sure they are relative somehow!!!
I hope he's a relative. I'd like for her to have some blood relatives.
Spoiler
As far as I can remember, she and her brother aren't full-blooded siblings. They have different fathers. The bro's father was their mother's first love. He was a magician but he unfortunately died. Camilla's dad is allegedly a noble from another country, but I can't confirm if the Duke here is actually her dad
someone says in the comment that he's her biological father but He got into an accident and had an amnesia so he forgot them
Σ(っ°Д °;)っ
Ahh the amnesia trope
I have a feeling the Duke is her biological dad