My advice for the wales kids and W&C- follow the example of the king and Queen of Spain and how they have raised their two daughters. Princess Leonor who will one day be queen.
So from 12, George should start attending certain public events with his father. Just those two. Nothing required of George though, he’s just there supporting his father and watching what he does. Maybe twice a year?
Then at age 14 he should have a little more involvement, maybe say something (princess leonor gave a very impressive speech at 14) and attend more events.
Often, when the king and queen of Spain attend events with the two girls, the queen stands with the youngest daughter while princess Leonor stands with her father. I think this is what Kates role should be- stand and support Charlotte and Louis and show what supporting the monarch means. While William and George are on stage etc. There needs to be a clear delineation between the children and what their future roles will be. By 18 George should be undertaking functions on his own.
This is where I think things went dramatically wrong for William and Harry.
They were brought brought up together, when Williams guidance and training should have started much much earlier. This is also what lead Harry to believe he was more important than he is and how he became a third wheel to William and Catherine in the end.
The other problem was, Charles never took William under his wing to show the ropes, and as Diana and Charles were separated, she wasnt there standing by Harry’s side supporting the future heirs.
With their mother dying, I understand the palace wanted to protect William and Harry but what happened was neither of them really started public duties until they were 30!
This was far too late for William. He should have been given a more prominent role much earlier and this would have kept Harry in check. But that only came way too late down the line once he married meghan and then realised, that he wasn’t important after all.
So William guiding George and Kate guiding Charlotte and Louis. Training for George much earlier, following a path similar to Princess Leonor.
I think the King and Queen of Spain are relatively close to the BRF so I do think they will be a big influence.