Prince George and Princess Charlotte are set to walk behind the Queen's coffin during her state funeral on Monday after their parents, the Prince and Princess of Wales, decided to allow it.
William and Kate are said to have thought long and hard about the decision for their children to say goodbye to their great-grandmother at what is expected to be the most-watched television event in history.
The Mirror reports how Prince George, aged nine, and his sister Charlotte, aged seven, will join the huge 2,000-strong congregation at Westminster Abbey for the 11am service on Monday, September 19, with two million Brits expected to watch from the streets of London.
READ MORE: Where can I watch the Queen's funeral in Edinburgh? Times, locations and events
William and Kate's third child, four-year-old Prince Louis, will stay at home during the day's events, which began as early as 6:30am. The children of the Prince and Princess of Wales have yet to be seen in public since the Queen's death was announced on September 8.
The Mirror previously revealed plans by the Queen for her three heirs to appear with her on the Buckingham Palace balcony on the last day of her Platinum Jubilee celebrations, with one palace insider saying: "The Queen was utterly determined that the future of the monarchy should be on show for all to see."
George and Charlotte are set to walk together behind their parents, walking side-by-side in formation, followed by their aunt and uncle, the Duke and Duchess of Sussex, and other family members. The King, Charles III, and his wife, the Queen Consort, will be directly behind the coffin, followed by the remaining three of Her Majesty's siblings, the Princess Royal, the Duke of York and the Earl of Wessex.
Prince William previously told mourners how walking behind his grandmothers coffin from Buckingham Palace to Westminster Hall last week was "very difficult" and that it brought back haunted memories of his mother's funeral.
A decision was last night yet to be made as to whether young George and Charlotte would take part in a similar procession at Windsor Castle for the separate committal service, before the Queen is laid rest at a private burial service at 7.30pm this evening.
A royal source said: "This was definitely a collective family decision."
The news came as the order of service for the Queen's state funeral was published for the first time, revealing a rousing selection of Her Majesty's favourite hymns, songs, prayers and recitals, all of which were chosen by the late monarch.
The full schedule can be found here.
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