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Princess Diana emphasized a specific feeling about Prince William and Prince Harry, whose broken bond shows no signs of healing

Diana said her sons had one another "for a reason," her biographer Andrew Morton tells PEOPLE in this week's exclusive cover story

Strain remains between the Prince of Wales, 43, and Duke of Sussex, 40, amid a bitter rift

Princess Diana was adamant that her sons, Prince William and Prince Harry , should be there for one another, which makes their estrangement so painful today.

"Diana always used to say she had two boys for a reason — the younger would be there to support the older in the lonely task as future king," Diana's biographer Andrew Morton tells PEOPLE in this week's exclusive cover story.

"There is no doubt Diana would have tried

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