Cast your mind back to the Queen's Platinum Jubilee in 2022. In a blink-and-you-miss-it moment, Louis fancied watching the goings on from the comfort of his grandfather's lap.

In the video from the event, Prince Louis appears to shout "Pa!" at his father, Prince William, who relays the message to his father, King Charles. William then says, "Grandpa, can Louis sit on your knee?" as Louis cheerily skips onto the monarch's lap, leaving Queen Camilla in fits of giggles. 

The King has an impeccable bond with all his grandchildren, not just with George, Charlotte and Louis, but with Camilla's grandchildren, Lola, Freddy, Louis and Gus.

"My grandchildren adore him, absolutely adore him," Camilla said. "He reads Harry Potter and he can do all the different voices and I think children really appreciate that."

According to HELLO!'s Royal Editor Emily Nash, "The King is close to all of the Wales children and regularly meets up with them at Windsor on Sundays."

Prince William has praised his father as a "brilliant" grandfather. Emily points out: "The Queen has often talked about her husband’s delight in reading books to his grandchildren, doing all the different voices in the Harry Potter series, for instance, and crawling around on hands and knees to entertain them. He clearly has a warm and playful relationship with them and delights in spending time with them when he can. No doubt it brings back happy memories of his own sons at the same age."

The Prince and Princess of Wales named their third child Louis Arthur Charles. While the second Wales son carries "Charles" in his name, his grandfather, whose full name is Charles Philip Arthur George, has "Arthur" as a middle name.

After Louis' birth in April 2018, the King said: "It is a great joy to have another grandchild," jokingly adding, "The only trouble is I don't know how I am going to keep up with them."

The King has not shied away from publicly showing his love for his grandchildren. In 2026, the doting grandpa blew a kiss to Prince Louis, Prince George and Princess Charlotte as he arrived at St. George's Chapel for Easter service.