US Royal Watcher - Everything you say does not convince me that George is not being raised royal. Being called 'sir' is an anachronism, it's Medieval, and way past it's time. I also see nothing alarming about the fact that George bonded to his mother and extended family rather than a nanny in his first few months.
As best as I can make out, from everything you say, the BRF will be relaxed and modern, like the Danish royal family. A very good thing imo. I say that as an American, with American sensibilities. I can't speak for those under monarchial rule, of course.
Anyway, I think I see William dispassionately. I think his mother never intended for William not to be king. William will be king and will be king with all the sense of privilege and entitlement his class engenders, as will George. Just a hunch.