George, 9, Charlotte, 7, and Louis, 4, are now using the last name Wales, a change from the name they've each used since birth, Cambridge.
The siblings, whose parents are Prince William and Kate, now go by the titles Prince George of Wales, Princess Charlotte of Wales and Prince Louis of Wales.
The children's new titles were used in the Order of Service released by Buckingham Palace for the queen's funeral Monday, which George and Charlotte attended alongside William and Kate.
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