When Kate Middleton says the 'secret code', George, Charlotte and Louis know they're close to being in trouble

Kate Middleton has a 'secret code' for George, Charlotte and Louis when they are misbehaving

Prince George looks just like Prince William when he was the same age

Prince George is the spitting image of Prince William in new birthday picture

Prince George, Princess Charlotte and Prince Louis are Kate Middleton and Prince William's three children

Kate Middleton and Prince William's children's full names, ages and royal titles

Kate Middleton and Prince William have a collection of royal homes

Where do Kate Middleton and Prince William live? A look at their family home

Showbiz

How Prince William and Kate Middleton told Prince George he would be king one day

How Prince George was told he will be King one day by Prince William and Kate Middleton

How Prince George 'persuaded' King Charles to change Coronation tradition

Prince George 'persuaded' King Charles to change centuries-long Coronation tradition

Prince George is a Page of Honour at the King's coronation

The meaning behind Prince George's Page of Honour outfit at King Charles' coronation

Prince George made a cheeky quip to his classmates

Cheeky Prince George told classmates ‘my father will be King so you better watch out’