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, 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

Here's the story behind Prince Louis' full name, rooted in Royal Family history

Prince Louis' full name and special meanings explained

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

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Kate Middleton reveals her sweet nickname for Prince Louis

Kate Middleton reveals her sweet nickname for Prince Louis

Prince Louis is missing from the King's Coronation

Why Prince Louis missed part of the King's coronation service

Prince William, Kate Middleton and Prince Harry will all have roles to play on King Charles's Coronation

King Charles Coronation: All the royal family roles from Prince William to Kate Middleton

Prince Louis made a very sweet comment to the Princess of Wales following the Queen's death

Prince Louis' sweet comment to Kate Middleton following Queen's death