What's horrible is that the mother is aware she was negligent towards her child, but instead of saying "I'm sorry for being unable to love you" or something in that sense, she immediately started blaming her daughter "I didn't like you so you decided to get revenge". I think we can all see why the original villainess became what she was.
What a pathetic father as well. He just stands there, going on about how "It was our fault the last Darkness blessed became a villain", refusing to take a stand towards the situation he can see is repeating. After implicitly accusing his daughter of attempted murder, he just says "Sorry" and refuses to comfort her. Later he would probably tell the butler "I just don't know how to deal with her".
Well, if that's the case he should probably step down and give the butler his job, because he seems to be a lot better at it (as lord and father).