Meaning that George – who turns five today – has no idea that he will one day become king.
William, 36, previously revealed: “There'll be a time and a place to bring George up and understand how he fits in, in the world.
Writing for ‘William & Catherine: A Family Portrait’, Gill Knappett said: “Like his father did, Prince George is enjoying as normal an upbringing as possible, with two parents determined to let him have as much privacy has possible.
“Although they want his early years to be comparatively free from protocol and formality, they know they have to balance this desire with a respect for royal tradition.
“Their son, after all, will one day be Head of State.”