Prince Harry and Prince William will meet for the unveiling of a statue for their mum Diana (Image: EMPICS Entertainment)

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Prince Harry cannot repair his relationship with Prince William before their reunion next month, a royal expert has claimed.

Ingrid Seward believes the two brothers will not have enough time to heal their rift before they are expected to meet to unveil a statue for their mum Diana, Princess of Wales.

Harry, 36, William, 38, will unveil the exhibit they have been working on and designing since 2017.

The Duke of Sussex has confirmed to aides he will be attending the ceremony next month, despite concerns he might not have been able to do so in person.

A plinth for the statue has been laid in the palace’s Sunken Garden, said to be Diana’s favourite spot in the grounds.

Harry, Kate and William at a Marathon Training Day at the Queen Elizabeth Olympic Park in 2017
(Image: Getty Images)

Royal author Ms Seward told the Express : "I am sure Harry will be there and put on a good show with William.

"You can’t repair a relationship overnight so whether they try or not remains to be seen."

The ceremony will take place on July 1, on what would have been Diana's 60th birthday.

A source previously said: “Harry has said he will do his utmost to be there. He wants to put on a united front with William and pay an appropriate tribute to their mother.”

Prince Harry and Meghan Markle welcomed their daughter Lilibet last week
(Image: UK Press via Getty Images)

Earlier this week Roya Nikkhah, royal editor of the Sunday Times, said: "Both William and Harry know this moment is a huge global moment, and that moment has to be about their mother's memory.

"So, in the same way they did for the Duke of Edinburgh's funeral, I'm absolutely certain they will put any personal differences aside for that day to make sure that it goes off well and they honour their mother in the way that they wanted to with that statue.

"So I don't think we should expect to see any froideur or distance there."

Harry and William with their dad Prince Charles in 2002
(Image: Getty Images)

In a bombshell interview with Oprah Winfrey in March, Harry said his relationship with William was "space".

He said: "As I've said before, I love William to bits. He's my brother.

"We've been through hell together. I mean, we have a shared experience. But we're on different paths.

"The relationship is space at the moment. And time heals all things, hopefully."

Harry and William as children during a visit to Thorpe Park with their mum Diana
(Image: UK Press via Getty Images)

The two brothers met in April at their grandfather Prince Philip's funeral and were seen walking together, with Kate acting as a "peacemaker".

Last week, Harry and Meghan welcomed their daughter Lilibet, whose second name is Diana in honour of the late princess who was killed in a tragic car accident in 1997.

Yesterday, Kate Middleton said she cannot wait to meet her niece when she was asked during a visit at a school in Cornwall.

She told reporters there: "I wish her all the very best, I can't wait to meet her because we haven't yet met her yet so hopefully that will be soon."

Kate was also asked if she has ever Facetimed the week-old baby, to which she replied "no, I haven't".