That was so impulsive and stupid it made me quite watching the show for a time for having such a Cheesy villain like an 80s action B-Movie. I know he said it's to stop news of his Sickness from getting out, but then he goes and tells the Daughter about it anyway one or 2 episodes later which totally defeated the purpose of killing her parents. I hate thoughtless impulsive villains. How could he ever become a Baron and earn the respect of his people doing such rash thoughless actions?
He actually thinks the Daughter believes that Sunny killed her parents? Hell he didn't even ask Sunny if he told her about the incident, which Sunny probably would have been honest and said so. So Dumb.