Mike Tindall has spoken candidly about the devastating toll Parkinson's disease has taken on his father Philip, who has lived with the condition for more than two decades.
The 47-year-old, who is married to Princess Anne's daughter Zara, revealed the profound impact of watching his father's decline over the years.
The former England rugby international said: "My dad is not doing great at the moment.
"Parkinson's is brutal, and there is no let-up from how it attacks the body and changes people."
Mike Tindall pictured with Zara and his parents in 2006
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He continued to tell Hello!: "After 23 plus years of the disease, it has quite honestly left him a shell of what he once was, which is why I don't want anyone else to see a parent or loved one suffer and have their quality of life decline so massively."
Mr Tindall's personal connection to Parkinson's has driven his commitment to charitable endeavours aimed at finding a cure for the neurological condition.
Philip Tindall himself enjoyed a lengthy rugby career, representing Otley Rugby Union Football Club for several years before his diagnosis.
The father and son share an exceptionally close bond, with Mike having previously described Philip as "an absolutely unbelievable father" in earlier interviews.
Mike Tindall's father, Philip, is living with Parkinson's disease
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Mr Tindall has credited his father's guidance and knowledge of the sport as instrumental to his own achievements on the pitch, which included winning the 2003 Rugby World Cup with England.
The wisdom passed down from Philip during those formative years helped shape the younger Mr Tindall into one of the country's most accomplished centres of his generation.
Witnessing his father's gradual deterioration has strengthened Mr Tindall's resolve to support research into the disease and prevent other families from experiencing similar heartbreak.
Mr Tindall made the emotional disclosure whilst attending the Celebrity Golf Classic in the West Midlands, a charity tournament supporting Cure Parkinson's and The Matt Hampson Foundation, which aids individuals who have sustained sporting injuries.
Zara Tindall sharing a hug with her father-in-law, Philip Tindall, in 2006
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The event coincided with his wife Zara's birthday, prompting the former rugby star to share a photograph on Instagram showing the couple arm-in-arm at the tournament.
"I can't believe she's letting me play golf on her birthday," he wrote alongside the image. "What a legend!"
The gathering attracted several notable guests, including actor James Nesbitt and Autumn Kelly, the former wife of Zara's brother Peter Phillips.
Sport has served as a foundation for the Tindalls' relationship since they first met in a Sydney pub, where Mike was consoling himself after being dropped from the Rugby World Cup semi-final squad.
Zara Tindall was spotted celebrating her 45th birthday with her husband, Mike, at the Celebrity Golf Classic in the West Midlands
| X: MIKE TINDALL"It helps us understand each other," the former rugby captain explained to A Round with Radar. "You can recognise what framework we're in and understand people's routines and how to be supportive of each other at the right times."
The couple, who married at Canongate Kirk in Edinburgh in 2011, have become central figures among the younger royals.
An insider told The Times in 2024 that "The Tindalls are very much the glue of their generation of royals and bring the fun to a family gathering, no matter how serious the occasion."
Mr Tindall is reportedly relaxed and playful with Prince George, Princess Charlotte and Prince Louis, helping bring normality to family occasions.