Of all the titles King Charles holds, it is ‘Grandpa Wales’ that he is most proud of.

Charles, 76, is a grandfather of five but he has a particularly special bond with the Prince and Princess of Wales’s youngest son Prince Louis, who turns seven years old this week.

During lockdown, Clarence House posted a sweet picture of Charles hugging his grandson to mark his second birthday on April 23, 2020.

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Two years later, the adoring pair were reunited at the late Queen’s Platinum Jubilee Celebrations where their close bond was captured on camera.

While watching the Pageant, the young prince showcased an array of amusing expressions as he sat next to his mother Catherine, then-Duchess of Cambridge, in the Royal Box.

He was seen clenching his fists, sticking out his tongue, waving his arms in the air, putting his hands over his mother’s mouth and standing on his seat for a better view of the spectacle.

The restless four-year-old soon became bored with the seating arrangement and asked his father Prince William for ‘Pa’ indicating he wanted to see his grandfather.

Speaking to MailOnline, expert lipreader Juliet Sullivan revealed William leaned across Camilla to ask Charles: ‘Grandpa, can Louis sit on your knee?’ to which he replied ‘of course’.

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Clarence House posted a sweet photograph of Charles hugging Louis to mark the young prince’s second birthday on April 23, 2020

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Prince Louis sits on his grandfather’s lap during the Platinum Jubilee celebrations in June 2022

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William leaned across Camilla to ask Charles: ‘Grandpa, can Louis sit on your knee?’ to which he replied ‘of course’

Catherine stroked Louis’s shoulder before he got out of his seat and walked to his left towards his grandfather.

The four-year-old prince then sat on Charles’s lap who rocked him from side to side, making for some adorable family photos.

One royal fan tweeted: ‘Prince Charles and Prince Louis have the best bond.’

‘Lovely to see Prince Charles in grandpa mode with Prince Louis today!,’ wrote another.

Their grandfather-grandson bond has undoubtedly strengthened over the years as it was recently revealed that the soon-to-be-seven-year-old shares his Charles’s love of art.

In February, the Princess of Wales shared portraits created by her three children as part of her early years work encouraging parents to draw with their children.

And while fans quickly noticed the sheer artistic talent of George who created a line-drawn portrait of his mother sitting in an armchair, it was Louis’s attention to detail that wowed.

His drawing, which appeared to be drawn in red crayon, featured a beauty spot above his mother’s lip on the left side.

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The restless four-year-old was very grateful to be seated beside his grandparents

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Prince Louis cheered while watching the pageant on the fourth day of celebrations

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Sitting in the Royal Box at the Platinum Jubilee Pageant in London, Louis got into the party spirit of the celebration

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The prince pulled more than a few faces as he watched the pageant from the Royal Box with his mother

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Mike Tindall jokingly tells a hyper Louis he is keeping an eye on him at the Platinum Jubilee

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Catherine shared a portrait created by Prince Louis as part of her early years work encouraging parents to draw with their children and fans were wowed by the young prince’s attention to detail in including his mother’s beauty spot

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Prince Charles painting in Klosters, Switerland on a skiing holiday with his family

For more than fifty years, King Charles has used any spare moment he has to create watercolour paintings – some of which have been displayed in exhibitions in London and Australia.

He has frequently been seen whipping out his paintbrushes while in Klosters, Switzerland during his family skiing holidays.

Previously the chairman of the Royal Collection Trust, Charles has seemingly passed this passion on to young Louis.

But the pair are connected not only by their shared interests but their names.

Born in 1948, Charles was christened Charles Philip Arthur George. Born 70 years later in 2018, Prince Louis’s full name is Louis Arthur Charles.

Aside from the obvious use of Charles as a middle name, the name Louis is thought to be a tribute to the King’s beloved uncle, Louis Mountbatten, who was assassinated by the IRA in 1979.

Although it is normal for senior royals to name their children after other members of the family, it seems Charles is a particularly deserving grandfather.

When Prince George was born in 2013, Charles spoke of how ‘overjoyed’ he was to have become a grandfather.

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Princes Charles and Camilla leave St Mary’s Hospital after visiting their newborn grandson Prince George in 2013

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Charles spoke of how he was ‘overjoyed’ to become a grandfather. Pictured here holding a teddy bear for Prince George during a visit to Sandringham Flower Show

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King Charles stands beside the Prince and Princess of Wales and three of his grandchildren: George, Louis and Charlotte at Trooping the Colour in 2024

He explained: ‘Grandparenthood is a unique moment in anyone’s life, as countless kind people have told me in recent months, so I am enormously proud and happy to be a grandfather for the first time.’

In a touching tribute to his first grandson, Charles planted trees at Balmoral and called it Prince George’s Wood.

During a 2018 interview for Prince, Son & Heir – Charles at 70, Queen Camilla said of her husband: ‘He will get down on his knees and crawl about with them for hours, you know making funny noises and laughing and my grandchildren adore him, absolutely adore him.’

She continued: ‘He reads Harry Potter, and he can do all the different voices, and I think children really appreciate that.’

In agreement, William described Charles as a ‘brilliant grandfather’ – although he wished he could spend more time with the grandchildren.

‘It’s something I’m working more heavily on, put it that way,’ William said. ‘I think he does have time for it, but I would like him to have more time with the children.

‘I think he’s… now he’s reached his 70th year it’s a perfect time to consolidate a little bit because as most families would do, you are worried about having them around and making sure their health’s okay. And he’s the fittest man I know but equally I want him to be fit until he’s 95.

‘So, having more time with him at home would be lovely, and being able to you know, play with the grandchildren. Because when he’s there, he’s brilliant. But we need him there as much as possible.’