It was announced on Thursday that Duke and Duchess of Cambridge will maintain a separate staff for the Duke and Duchess of Sussex. The former will remain in Kensington Palace while the latter will move into Buckingham Palace. However, Prince William was apparently worried whether his brother would have sufficient support, then turned to his grandfather for advice.
According to the Daily Mail, he called Prince Philip several weeks ago to seek his "wise advice".
It is unknown which advice Prince Philip, who has lived in Buckingham Palace for much of his adult life, gave his grandson.
William may also be concerned about the move would burn rumors of a rift between Cambridge and Sussex households.
These discovered after it was revealed that Harry and Meghan would not join William and Kate to live in Kensington Palace originally planned, but would instead move into a cottage at Queen's Sandringham property.
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There were also several reports of clashes between Kate and Meghan, including Princess Charlotte's bridesmaid business for Last Corn's Royal Wedding and staffing.
The new arrangements were reportedly decided to help prepare for Prince Williams' future role as the Prince of Wales and later King.
Both Queen and Prince Charles are said to have benefited the move.
Speaking to the Daily Mail, one source said, "It's about placing the two dukes permanently, ensuring that changes aren't needed again".
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Meghan and Harry have also hired a new chief spokeswoman, Sara Latham.
Ms Latham is close to Clinton's, after advising Hillary's 2016 US presidential campaign and working for Bill when he was president at the end of the 1990s.
The Duke and Duchess of Cambridge have stated that they will remain based on Kensington Palace when William becomes Prince of Wales, rather than moving into Clarence House.
Currently, Clarence House is occupied by Prince Charles and his wife, the Duchess of Cornwall.