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Royal biographer Robert Lacey believes that over time, Prince Harry and his brother Prince William will repair their reported rift.
The author's new revised book claims talks of a family negotiation following Prince Philip's funeral were not true, with it also suggesting the brothers had been on bad terms for a while even before Harry stepped back from his royal duties.
William and Harry were said to have had a bitter row according to the book, with this said to have led to the family divide.
Speaking on Good Morning Britain, Robert discussed Harry's looming arrival in the UK ahead of the unveiling of a statue in honour of his late mother, Princess Diana.
Royal biographer Robert Lacey believes that over time, Prince Harry and his brother Prince William will repair their reported rift
The author said this could be the moment that things change, as the brothers unite to remember their mother.
He said of the meeting not going ahead: "Apparently nothing came of it once they got inside, certainly the report that they had a big family sit-down was sadly denied by both sides."
Robert added: "You just showed Gayle King, their friend, talking on television. I think the feeling was when it came to the Oprah interview, as ghastly as it was with all these family revelations being aired, that was it.
Prince William, Duke of Cambridge and Prince Harry will attend the statue unveiling
(Image: Getty Images)
"That was a sort of fresh start, and then suddenly the family discover that actually their friend Gayle King has more to say, and then Oprah said some more.
"The feeling was you can't have a serious family negotiation if it's going to be talked about on American television the day afterwards. This would make things a problem."
On the brothers moving forward though and us seeing them repair things, he said: "I think we will.
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"I mean we’ve got something coming up as you know, the first week of July, both brothers are committed to being in London at the same time.
"I think that will be the occasion when something were to happen, who can predict, but they they are coming to honour their mother.
"Surely, now I'm talking as much as an outsider here as you are, surely one would say when they're gathered together to honour their mother and what Diana stood for, that will be the time when we can hope for some sort of reconciliation and serious talk.
"Otherwise, if they just appear together in public in front the statue and there's nothing more, I think we will rightly conclude it's a superficial gesture."
Good Morning Britain airs weekdays at 6am on ITV.