Prince William and Prince Harry were not interviewed for King Charles's new insightful documentary, which is due to air on Boxing Day.
It is believed that the Prince of Wales's household wanted the focus to remain on his father in his Coronation year.
This comes as the Duke of Sussex did not feature in the documentary at all, despite flying from Montecito to attend the Coronation.
Prince William and Prince Harry were not interviewed for King Charles's new insightful documentary
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It will feature both the Coronation rehearsals and the events of that momentous day.
Prince Harry, 39, took a plane from his California home to London to attend his father's Coronation.
He left the UK immediately after the service to return home to his wife Meghan Markle and their children, Prince Archie, four, and Princess Lilibet, two.
Princess Anne, who was interviewed for the documentary, provided insight into the last days of Queen Elizabeth II's life.
Prince William appeared in the documentary but he was not interviewed like his aunt, Princess Anne
Reuters
The Princess Royal explained how the late Queen was convinced to step back from the "decision-making process" surrounding her death, as the former monarch thought it would be "difficult" for officials if she died at Balmoral.
Anne, 73, claimed it was "serendipity" that she visited Balmoral before her mother died.
She added that she "weirdly felt a sense of relief" when the Imperial State Crown was removed from her coffin, signifying King Charles's assumed leadership of the Royal Family.
Speaking about her mother, Anne said: "I think there was a moment when she felt that it would be more difficult if she died at Balmoral.
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King Charles was crowned by The Archbishop of Canterbury during his Coronation in Westminster Abbey
PA"And I think we did try and persuade her that that shouldn’t be part of the decision-making process."
She added: "So I hope she felt that that was right in the end because I think we did."
After 70 years on the throne, Queen Elizabeth II, the longest-serving monarch in UK history, died quietly at age 96 on September 8 at Balmoral Castle in Scotland.