The Princess of Wales and her father-in-law, King Charles, have an incredibly close bond. But did you know Kate has the sweetest nickname for her father-in-law behind closed doors?
The Mail's Richard Jobson reported that Kate calls Charles 'Grandpa,' according to a courtier. His Majesty is known to have a couple of affectionate names for his daughter-in-law, including both 'Beloved daughter-in-law' and 'Darling daughter-in-law.' According to the report, he always greets her with a "loving kiss."
Back in April, a source told HELLO! that while the pair have always shared a close relationship, the bond between them grew as they turned to each other for comfort during their respective cancer diagnoses and treatments.
The King paid Kate a bedside visit when they were both staying at the London Clinic, and the pair shared a private lunch in Windsor the day before she revealed her cancer diagnosis to the world in March.
Robert Hardman, author of "Charles III," also explained: "It's very clear that he's extremely concerned about her. I think he wants to make sure as much as he can that if there's anything he can do, he will do, because for a very fit and healthy young mother, this is a different order of magnitude than someone having to deal with this in their 70s.
"I'm sure he's been a source of comfort for her in the same way she's probably been a source of comfort for him," he adds. "I think it cannot but have brought them even closer together. He's always had a huge regard for his daughter-in-law. He thinks she's just wonderful.
"When people are in the hospital, they don't really want a fuss. But the fact was: the King was there, she was there, and the Queen was there with him as well. And they did go around to check and reassure the Princess.
"It's a reminder that the Windsors are mortals like the rest of us. And we have to have great sympathy with the fact that they are undergoing an absolute shock of a lifetime, except they're having to undergo it with all of us talking about it."
It seems that Charles and Kate set off on the right foot from the very beginning. Back in 2010, during the Princess' official engagement interview alongside her now-husband, she mentioned how well her first meeting with the King went.
"I was quite nervous about meeting William's father, but he was very, very welcoming, very friendly. It couldn't have gone easier, really, for me."