PUBLISHED: 09:03, Fri, Oct 9, 2020 | UPDATED: 09:03, Fri, Oct 9, 2020
Prince Philip didn't hesitate to act when concerns regarding Prince William arose following Prince Charles and Princess Diana's separation. The Duke of Edinburgh pushed the Queen to break her tradition of staying out of family issues and get closer to her grandson and successor, royal author Robert Lacey wrote.
Mr Lacey wrote in his upcoming book, Battle of Brothers: "It was then three years after his parents' separation - just two years before Diana's death - and the Queen was worried about her grandson's state of mind."
The Queen, the author added, confessed to one of her advisers she feared young William could be struggling mentally after the divorce of his parents and their private relationships had become a public affair.
This pushed Prince Philip to make a move, the author claimed, and take advantage of the fact the teenager was at the time attending Eton, just a short walk away from Windsor Castle.
He wrote: "The Duke of Edinburgh intervened.
Prince Philip intervened amid concerns for Prince William's wellbeing, an expert said (Image: GETTY)
Prince Philip and Prince William during an engagement (Image: GETTY)
"Philip shared his wife's concerns and he suggested that she overcome her longstanding aversion to involvement in messy family matters by trying to get closer to this particular boy - who was not just her grandson, but a future inheritor of her crown.
"Perhaps the lad could come up and join them both in the castle from time to time on a Sunday, when the Eton boys were allowed out into the town?
"And so the lunches had begun."
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Prince Philip, Prince William and the Queen had Sunday lunches together at Windsor Castle while William was at Eton (Image: GETTY)
Prince Philip's move started a tradition which saw Prince William