WINDSOR-Prince Harry and Meghan Markle's wedding was in turmoil on Tuesday after a reported string of U-turns from her father over whether he will attend, just four days out from the big occasion.

Thomas Markle had been due to walk his daughter down the aisle during the meticulously-planned ceremony at Windsor Castle's St. George's Chapel on Saturday.

He had decided against travelling from his home in Mexico to accompany his daughter due to his health - and to spare her further embarrassment after a paparazzi scandal where he posed for staged pictures, according to celebrity news website TMZ.

But the site Tuesday reported an about-face from Markle, after he had been contacted by his daughter via text. "I hate the idea of missing one of the greatest moments in history and walking my daughter down the aisle," he told the site.

He told TMZ he was in hospital again after suffering chest pains, a week on from a heart attack.

In a brief statement, Harry's Kensington Palace office did not confirm what the issue was, saying only: "This is a deeply personal moment for Ms Markle in the days before her wedding.

"She and Prince Harry ask again for understanding and respect to be extended to Mr Markle in this difficult situation." The palace could not be reached for further comment on Tuesday evening.

Thomas Markle told TMZ he had agreed to pose for a paparazzi photo shoot in a bid to rehabilitate his image, rather than for money, but that he now regretted the move. The pictures - in which he was being measured for a suit and admiring a photo of the future royal couple on his computer - sold for $100,000 (83,000 euros), according to British tabloid the Daily Mirror. TMZ said he had suffered a heart attack last week due to stress and that he was continuing to suffer from chest pains.

Markle senior said his ex-wife Doria Ragland would be a good choice to walk their daughter down the aisle in his place, according to the website.

Meanwhile, Meghan Markle's half-sister Samantha Grant, who has criticised the bride-to-be's relationship with her father's side of the family, revealed her dad was feeling "quite depressed" and had indeed suffered a heart attack.

"I don't know as of today what his plans are, but there's a very real concern," she told Britain's ITV television. Whether he attends the wedding will be based on "whether or not it's safe" for him to go, said Grant. She said her father had "suffered at the hands of the media" who had presented him "in the most horrible ways".

Staging the photos was intended to counter the way he had been "so unfairly presented in the media as being sort of shabby". Markle's gaffe-prone family has been sending royal courtiers into something of a spin by airing its dirty laundry in public.

Kensington Palace's attempts to project a sense of serenity around the wedding preparations have been clouded by Thomas Markle's relatives, who have not been invited to Saturday's nuptials following stories of bust-ups, heavy drinking and an arrest.

Half-brother Thomas Markle Junior accused his half-sister of shunning the family in an open letter last month. In what The Daily Telegraph newspaper called "the circus" surrounding the wedding, Tom Junior's ex-wife Tracy Dooley - also not invited to the wedding - rolled into London with her two sons Tyler and Thomas. "We're here! Yay!" she said, posting pictures of London landmarks, after they were spotted pushing luggage through Heathrow Airport, Tyler turning up in a vest. The Dooleys are reportedly appearing on ITV's Good Morning Britain programme as part of their royal wedding coverage. US actress Markle grew up in Los Angeles and remains close with her parents, who divorced three decades ago.

Her 73-year-old father is an Emmy-winning Hollywood lighting director who retired to Mexico, while her mother, 61, is a yoga instructor and clinical therapist.

Ragland, who has reportedly already arrived in Britain, is expected to spend Friday night with her daughter in a plush hotel before travelling with her by car to Windsor Castle.

On Tuesday, Americans in Windsor ahead of the wedding were sympathetic to their compatriot.

 

"It's disappointing for her," said Jean Rice, 48, from Orlando.

"But things happen. I hope they're happy."

Karen Yaney, 64, from Chicago, said she hoped Markle's father would attend.

"Staging those photos, that didn't seem so awful. I imagine she's on the phone with him trying to persuade him to come," she added.