Exactly! I 100% agree. He should have done something. Even if the father kept a close eye on him, he could send a simple letter telling her that she wasn't alone and their mother's death wasn't her fault so she didn't feel guilty!
He can't do anything because the duke (their father) is still the duke basically the power is still in their father's hand so he can't do anything
IIIIIIIIII mean a corpse can't be a duke in fact once his father is a corpse then he is the duke. Seeing how the duke is I'm surprised more people didn't try to murder him. Though he would never see it coming from his son
Question: where was her brother? Why didn't he help? He clearly has no malice against his sister and thinks his father is insane. If I were him I would have killed that man.