With the passing of Queen Elizabeth II, not only do the people of the United Kingdom have a new King, but they'll soon have to get used to royal members taking on new royal titles and duties.
Apart from King Charles III, his wife Camilla Parker Bowles, Prince William, Kate Middleton and their three children, the Duke and Duchess of Sussex's son, Archie Mountbatten-Windsor and their daughter Lilibet "Lili" Mountbatten-Windsor, are now technically a prince and a princess respectively.