I think Harry, being the “spare”, saw his out and took it to protect Archie and now Lilibet. God only knows what he was privy to growing up. Uncle Andy’s antics come to mind, and Charles’ friendship with Jimmy Savile. Also, there was no possible way for Harry to be Hewitt’s. That romance began when Harry was two years old. Harry is the spitting image of a young Philip with the Spencer red hair for good measure (note that Beatrice is also a redhead, meaning that gene is in the Windsor gene pool.)