Tensions could deepen between Prince Harry and his brother if he breaks a pledge years ago never to talk intimately about their late mother in public again, a royal insider reportedly claims.
Prince Harry appears to have broken the brothers' vow, as he aired royal family rifts in a recent media outing.
The brothers had told ITV documentary on the 20th anniversary of Princess Diana's car crash death in 2017 that it was the last time they would speak candidly about the loss of their beloved mum.
Speaking on behalf of both brothers, Prince William said: "We won't be doing this again – we won't speak as openly or publicly about her again, because we feel hopefully this film will provide the other side from close family friends you might not have heard before, from those who knew her best and from those who want to protect her memory, and want to remind people of the person that she was."
But Harry spoke about the family intimately in a celebrity podcast last week.
Speaking to actor Dax Shephard's podcast Armchair Expert about life as a royal, Harry said: "Look what it did to my mum. How am I ever going to settle down and have a wife and family, when I know it's going to happen again?"
He said of Diana: "The massive immense impact that she had on us in the short time she was around was huge. Because all she wanted to do was make sure we had as normal a life as possible."
The trailer for Harry's new upcoming documentary with Oprah Winfrey also featured hints Harry would address his mother's tragic death publicly again.
The teaser clip for the new Apple TV mental health series The Me You Can't See features a clip of the young brothers at Diana's funeral.
The footage shows Harry, then just aged 12, watching his mother's coffin.
According to the Mail Online, the inclusion of the clip has raised fears in royal circles that Harry will use the new series to raise issues with the 1997 funeral procession.
Buckingham Palace has since faced criticism over the controversial decision to have the two young boys follow their mother's coffin for a mile in the world's gaze, as one million people lined the streets of London and millions tuned into broadcasts around the globe.
A royal insider told the newspaper: "Of course this is Prince Harry's story to tell and he has every right to share it.
"But what you have to understand is that it goes very much against the strategy he agreed with William following the 20th anniversary of Diana's death.
"That's going to increase tensions between William and Harry, which sadly are already high."
The brothers are set to reunite again to honour their mother's memory, after meeting for the first time in around a year for their grandfather Prince Philip's funeral last month.
Harry and William are both scheduled to attend the unveiling of a statue in Kensington Palace's garden to Diana in July, to mark what would have been her 60th birthday.
