I was thinking possession too. No joke here.
I do a fair amount of work with autism spectrum/Asperger’s Syndrome. These minds are very unique in the way their thalamus in the brain sorts and prioritizes input.
In Scott Peck’s book “People of the Lie;The Psychllogy of Evil”, he has an entire chapter on people with autism are emotionally cold and have the potential of being the worst narcissists.
Keep in mind that both parents are mediocre actors.