
Spoiler about og roxanna
Og roxanna is weak comparing to current roxanna. She doesn't have good relationship with Jeremy. After ashil (her brother) die, she confined herself in her room until her mother dragged her out for the examination (?). She failed the exam and supposed to die but her mother begged Lant for her life. The og roxanna then met Cassis and fell in love with him. But cassis was mentally weak and ignored Roxanna who always talk to him. Cassis was supposed to be roxanna toy, but when she went out for some business she found out cassis was murdered by her half siblings under Lant's order. She then planned for the downfall of the Agriche. Roxanna met Sylvia(og fl) and called the other houses to destroy the Agriche. After they left, Roxanna used sorcery, made a contract with demon and use all of the Agriche as sacrifices to change the past and the future. It also hinted that og roxanna dreamed of a lady with butterflies which is the current roxanna we knew

Wait I don't understand. She is his niece but he said he's the dad? I know I'm stupid but I don't understand anything

Maybe he has a reason to keep it hidden, like for example if he has many greedy relatives and doesn't want them to show up and challenge his adopted daughter's inheritance rights in the future... or even if she's some dead sister of his' illegitimate baby that he took in, and he wants to protect his niece from the social stigma...

Of course, to most of the adults it shouldn't matter, but to the mc it might be important up to some point, if it helps her understand the lil girl better so they can keep getting along... which might be necessary if it's something the lil girl still hasn't been able to come to terms, with and there might be a good reason for that (like, for one, if she was previously with her real dad it'd be hard for her to call someone else "dad", even if it is just in front of strangers so as to avoid problems...), but whatever the reason the mc as her nanny would obviously have to find out in order to help her and/or not to act insensitive and step on a landmine...
I forgot that she is in otome game. That's explained why the monsters are cute