What I see is a family kinda doing the "tough love" avenue. They are not going to engage with his behavior, they aren't going to reward his behavior by having absurd conversations, I imagine their hope is if we say no he will stop and perhaps seek help to address his own issues. They have put up with his actions for decades, it must be tiring. He can word it however he wants but a constant barrage of attacking your family is not going to end in a positive way. I think at this point their only choice is to ignore him. He has spun himself such a world he might never break out of .. it's sad but at least he has the finances to support himself. They need to cut all ties, let him go, tough love.
The guy has done nothing but create a world wide spectacle of his disdain for his family & the monarchy. He is the complete opposite of peace. He starts a fire and then wants to be credited as a hero if he puts it out.
Now that he has spewed all this I have to wonder how it will impact his new Hollywood etc friends. Will he be seen as someone who will disclose their personal info to make a buck, who will twist and construe their interactions with him, someone who can't be trusted? Will they find their social circle shrinking because many of those folks try to be private in their lives ~ he clearly has no issue running his mouth and might no longer be a good fit. OR are they folks who had some tie to the monarchy and now don't want that severed by appearing to be in his pocket. Will be interesting to see what, if any, fallout he has outside the monarchy.