More news:
"The Prince of Wales’s children are expected to join their parents in a carriage behind Charles and Camilla, who will be in the Gold State Coach, according to rehearsal documents seen by The Times.
".....They will be joined by the Princess Royal, her husband Vice Admiral Sir Tim Laurence, the Duke and Duchess of Edinburgh, the Duke and Duchess of Gloucester, the Duke of Kent and Princess Alexandra.

Prince Andrew, Princess Beatrice, Princess Eugenie, Harry and Meghan are not expected to participate."





https://www.dailymail.co.uk/femail/article-11875415/Prince-Andrew-joined-Prince-Edward-weekly-Windsor-horse-riding-trip.html