
I think she is the duke's daughter.i think his wife was pregnant when the accident happened , and she didn't die just yet, the empress's sister save her and used the mana stone the green one on the duke's wife, and because she"the mother " is from the nation of the world tree it was easy , then the mother died and the empress's sister took care of Ellie.

I go against your theory and I tell you why, in my opinion her the empress sister is the mother and the father is the emperor. Since it is hinted at several times that he cheated on the current empress and her mother ran away with the greatest treasure "Ellie". Which would also explain her golden hair and her green eyes are explained because of the mana stone her mother put into her.

Her brother from mother's side, and those 2 brothers form her father's side , are all siblings? Or not iam so confused
I just realized that she found her biological father, and found out that she had 2 more siblings , and that her brother "the first one "
Is her half brother from their mother's side
Alot had happened
And without her stepfather nor her friends or stepbrother knowing anything
Literally no one knows, and this annoy me
Because i missed them ( ̄ε(# ̄)Σ
When will they show up, both sides will be really surprised

So the fl’s mother was with three different men. She had a son with the first, a daughter with the second, and then when she married the third she got a step son. So the fl has a half brother and step brother through her mother’s side and two half brothers from her father’s side. However, what confuses me is if the fl cheated on his wife since one brother is older and the other is younger. Unless he had two sons from two different woman. Though I wouldn’t be surprised if the elder one isn’t his biological son because of the gray eyes and black hair that don’t match him at all
I need it in more detailed way.
I'm not sorry for the sis , she married him knowing that he loves her brother , so she has no right to do this to her brother..