The twins who have lost both their mother and father had got their humongous inheritance stolen by their evil stepmother. The three sons of their stepmother have a special relationship towards their non-biological sisters. Thus, a scene of love, love and hate occurred in this old mansion. This is a fairy tale of romance and vengeance.
So the lesson is that if their roles were reversed, their relationship would have been sealed by chapter... [*looks it up*]... 14. Don't know how I feel about that.