You have no idea what happened at the meeting of Charles and Harry
By that definition, nor do you!
If I had cancer, as a parent of adult children,
my relationship with them would be my absolute first priority, over everything else. Even if I had perceived one of them as having gone astray. I believe that would be the ultimate priority and focus of most reasonable parents.
I think Charles has some good points, but I don’t think parenting has ever been his priority or strong point and that’s partly down to the pressures that being the member of a toxic institution puts on its members, and partly down to having been parented very poorly himself.