Actually, it seems like the girl is the daughter of the red haired woman, the mother who is always trying to kill the white haired boy, and her servant, who always helps her.
The brother is the son of the ex-head of the household, who died before the beginning of this story, and someone else. He was in a orphanage.
So.... It seems they are not blood related. Also, I think the brother died when he fell off a cliff after he was shot right at the beginning off this manhwa and the body is currently possessed by a god.
I thought they had the same dad, different moms
nope, the red haired mom and her secretary is her mother, but the mom (i think?) married into the family but didn't give birth to elios
Arent they half siblings or did I remember it incorrectly, why’d he kiss her...