Responses
She's not, if the girl she saw really was her age that would've meant the duke had been cheating on his late wife.
She's not, it has been stated early in the story that she was adopted. She was the product of her mother's prev marriage.
Also, the girl Raina(?) shouldn't be someone the 'duke cheated' w his wife but the daughter of the first duchess. Since she look like the duke, maybe their legitimate daughter the duchess carried before her accident.
I don't want FL to be the real daughter of the duke, because if she is then what happens to ravi? that'll be sad for him he'll really feel isolated and betrayed