Prince George turns 12 on July 22, which may mean that he and his father, Prince William, are no longer allowed to fly together. All about the royal protocol, and if Kate Middleton and Prince William will follow it.

With Prince George turning 12 on July 22, royal watchers are wondering whether the family will uphold a decades-old travel tradition. The rule, first enforced when Prince William turned 12, prohibits senior royals from traveling together — aimed at protecting the monarchy’s line of succession in the event of a tragic accident.

Kate Middleton and Princess Charlotte often wear coordinating outfits at public events, from Prince Harry and Meghan Markle's wedding to Wimbledon.