They still all have the same dad, so if it's revealed that he's royalty, yes they will all know lol, including her
I really feel like the author needs to clarify the relationships and birth order. When the prince and princess first appeared I thought they might be twins and from a previous queen since they look nothing like Haruto. But if the prince had to skip a grade so he could to school at the same time as Haruto then he must be younger. And the queen said the princess looks like the previous queen. So that means she's Haruto's older half sister? If the prince is Haruto's full younger brother then why doesn't he have black hair too? I'm just confused.
I can answer the last one-because even if theyre full brothers, they wouldnt be identical. The hair colour could still be taken from the king, instead of the queen/ex heroine. Recessive genes and all that.
i could be wrong here but i don't recall any mention of the current queen being the 2nd wife. i think she's the only wife of the current king. if they said the princess resembled the previous queen they might have been referring to her grandmother. i'm pretty sure the prince, princess, and MC are all full-blooded siblings and he's their younger brother.
I think the princess was the daughter of the previous queen and the son is the evil queen son
So haruto is full siblings witth the prince but half sibling with the sister
Since they all share the same brother so yes it’s incest but she doesn’t know that
I want him to become king already like lead a rebellion he has the royal crest to prove he is a prince and he has the power