Responses
It's a Japanese culture thing. Traditional gender roles aren't as frowned upon over there yet. And especially in medieval times the women were often the subservient ones being protected by the men and such. Like how women often weren't allowed to choose who they would marry, the father choosing a husband instead. I think this is kind of the same thing.
I don't think the brother should have anything to say about how Lily wishes to live her own life... It puts me off that he thinks he can decide for her :/