see that's the part that does not fit with a psychopath, he wouldn't bother with a video, after he was done, he'd just kill her. once the toy has been played with it loses its sparkle so throw it in the trash.
since you haven't figured it out, with the exception of bob, the entire family has been hot after each other for some time, now it's all being realized.. btw bob is in on it too haha and you thought he was blameless, a god etc... check the gallery, several scenes of his fucking his daughters. a true manipulator will do things that do not require him to give up anything he considers his own, he won't give up money cuz it's his money, if he becomes president he won't give that up either cuz he thinks it's his period. but real manipulators always fail cuz they are narcissitic basically. and a manipulative psychopath would be a serial killer. manipulates his target to get them where he/she can get at them without witnesses, then do whatever with them and kill them.