@nivinator Oh yeah, the father is a right bastard who doesn't give even an ounce of thought toward his family. He seems like the worst kind of narcissist.
As for why Lippe didn't tip off her parents earlier, it's because she knew that he was wearing girls' clothes, and that he murdered his parents, but she didn't know his mom was completely off her nut. She even laments that if she'd known how bad things truly were, she would have done something sooner.