The relationship with the brothers has allegedly now soured to the point where William does not want Harry to attend his coronation when the time comes.

An insider told The Sunday Times: “I always said the brothers would be there for each other at the end of the day, and that’s been proven wrong so far.”

A fundraiser to mark the 80th birthday of the “rejected and abandoned” Thomas Markle is still receiving donations over a month after his big day.

Set up by British socialite Lady Colin Campbell, she encouraged the public to donate to show Mr Markle that “there are still people in the world with good hearts, good values, and good intentions.”

Ahead of his birthday, Mr Markle, who has been estranged from his daughter the Duchess of Sussex since her 2018 wedding, said he wanted to reconnect and finally meet his grandchildren.

“I’ve never been one for birthdays, but I know the one person I most want to hear from, Meghan, won’t be in touch,” he told the Daily Mail.

“I would love to meet my grandchildren, but I would be happy with a photograph at this stage.”

At the time of writing, the GoFundMe has raised £56,785.

She is reportedly using this time to equip her three young children with the life skills they will need to navigate their unusual position in society.

“Charles’ cancer hasn’t gone away, the Palace have said as much, and to be brutally honest, the once-popular notion that he will live to a similar age as his mother [94] or father [99] is now less widespread,” an insider told The Daily Beast.

“I think that has very much focused Kate’s mind on the fact that there may only be a few years of freedom left. What does she want to do with them? Nurture her kids and try her best to equip them for the life ahead of them.”

Kate, 42, announced that she was undergoing “preventative chemotherapy” earlier this year after being diagnosed with the illness.

“Like a lot of people who have a brush with mortality, Kate is going to prioritise the things that matter to her from now on. In her case, that means her kids,” a source told The Daily Beast.

Former BBC royal correspondent Jennie Bond speculated that the women have bonded over their similar positions within the royal family.

“I think Queen Camilla and Catherine have drawn strength and inspiration from one another: two women in this extraordinary situation in life, both with the same bizarre destiny,” she told OK! magazine.

Kate, 42, was diagnosed with the condition earlier this year after planned abdominal surgery. Her exact type of cancer, like King Charles’s, has not been disclosed.

Former BBC correspondent Jennie Bond told OK! magazine: “I think you have to be quite tough to survive – and thrive – in the royal family,” Bond explained. “It must be easy to be rather intimidated by the hierarchical system of the palace.”

The Duke of Sussex’s alleged “perfect scenario” to work as a part-time royal is reportedly “off the table”.

Speaking on The Royal Record, Svar Nanan-Sen said that this will “never happen”, especially when Prince William ascends to the throne.

Svar said: “It was said that Harry felt that the part-time working royal role, that he and Meghan initially went for before it was agreed that it wasn’t possible and they stepped away from the monarchy, was his perfect scenario.

“And so there’s still a part of him when looking back at the Royal Family, there’s still a part of him that would want that and maybe still hopes for that.

The expert added: “It’s obviously not happening under King Charles, and it certainly looks like it won’t happen under William.”

Harry’s relationship with his family has steadily deteriorated since he left the UK for the US.

Her Majesty The Queen: Behind Closed Doors will air later this year on ITV1, ITVX, STV and STV Player, although its exact release date has not yet been disclosed.

Kate Teckman, ITV’s head of development and commissioning editor, said: “With exclusive access to Her Majesty as she meets the incredible survivors of domestic abuse, this film tells the stories of those who have suffered and their families, including Diana Parkes, as they bravely and selflessly share their experiences to raise awareness and help others.”

A panel of experts will be available on Zoom to answer questions during the event, which is taking place on 10 September at 7pm BST.

The panel includes twentieth-century historian Tessa Dunlop and Anna Pasternak, an international bestselling author and frequent royal commentator.

“I heard I was her favourite president.”