Still, it staggers the imagination that a large group of people (there are ~ a hundred of them, most of them "family") could be so hideously hateful for such a long period of time, just for money. It seems to me a like a type of psychopathy/sociopathy which I'm at a loss to explain or classify. It goes way beyond an itch for income.
Without further elaboration, let me just say the word "demonic" comes to mind.