According to a royal book, Prince William’s ‘second mum,’ Carole Middleton, helps him feel “secure and protected” while Prince Harry lacks experience with how solid relationships function.

Phil Dampier, a royal biographer, characterized Kate’s mother as a “power behind the throne.” Carole, 66, is a “stabilising and supportive force in the background” for the Duke and Duchess of Cambridge, who also looks after Prince George, Princess Charlotte, and Prince Louis.

Carole Middleton’s matriarchal impact on the Duke of Cambridge, 39, will take on further sadness this week as he unveils a monument commemorating his late mother Princess Diana’s 60th birthday.

Carole, the Duchess of Cambridge’s mother, has given the Duke of Cambridge with a “real sense of normality amid any chaos” since he married Kate in 2011, according to royal writer Angela Levin.

He was just 15 years old when Diana died in a vehicle accident a year after her divorce from Prince Charles.

Carole is also a “very strong woman” according to the royal expert, after rising from a “humble background” and founding the Middletons’ family company, Party Pieces.

According to the royal biographer, William’s “dysfunctional family background” provided him with “barely a clue of what a normal family life was like.”

Angela, on the other hand, says that his younger brother, Harry, has not experienced similar experience.

Angela said: ‘William adored Diana and was drawn to her magnetic charm, but she was relentlessly demanding on him as a young child, describing him as her “closest confidant” and talking about her lovers, when it’s a mother’s duty to care for her son, not the other way round.

‘[Carole] made him feel secure, comfortable and protected and he didn’t have to worry about what he said or be responsible for her emotions.’

“The Middletons have always been that anchor for Kate and William,” the royal expert told OK! magazine.

“It’s a real sense of normality amid any chaos.

“William has always loved spending time with all the Middletons as it’s his escapism.

“He’s close to Carole and Michael and always insisted the royal family treat them well, which the Queen has done.

“She welcomed them with open arms.

“William has found weekends away with them so relaxing.

“It’s a close-knit family and more than anything, they’re very normal.

“It’s the family dynamic he wished he’d had growing up and it’s how he’s trying to raise his own kids.”

After a difficult few months in which William and Kate had a painful and public split with his brother Prince Harry and Meghan Markle, as well as the death of Prince Philip, William and Carole’s tight relationship is stronger than ever.

Angela said to Fabulous: “She made him feel secure, comfortable and protected and he didn’t have to worry about what he said or be responsible for her emotions.

“Children of broken homes, especially if the parental break up was unpleasant, often don’t know how a good relationship works,” she said.

“William learnt through the Middletons how a loving and supportive family works. It has been the bedrock of making Kate loving, calm and confident. Harry hasn’t had that parental opportunity

“His background has just been of bitter fighting and incompatibility. Both he and Meghan come from very damaged backgrounds and must carry with them some of the negativity. It must be hard for them to help each other and lack experience in how stable, strong, understanding relationships work.”

According to the book, the prince learned how a ‘loving and supportive family works’ from Kate’s family.

“Carole is a very strong woman who comes from quite a humble background, and the fact that she has worked herself up with a successful business has given her a backbone of steel,” Phil Dampier told Fabulous.

“Kate turns to her for advice and comfort all the time and she spends a lot of time with William and Kate’s three children.

“Carole will be a stabilising and supportive force in the background, looking after the kids when needs be but also just being there for the.

“Carole is very much a power behind the throne and her influence is immense.”

Meanwhile, another source told the publication that, in the absence of Princess Diana, Prince William considers his mother-in-law to be his “second mother.”

Unlike his younger brother, Harry, William is notoriously ultra-private and cautious on issues of emotion, although he has previously spoken candidly about losing his beloved mother Diana, telling GQ: “I would like to have had her advice. I would love her to have met Catherine and to have seen the children grow up. It makes me sad that she won’t, that they will never know her.””

William and Harry plan to dedicate a statue to their late mother, Princess Diana, on what would have been her 60th birthday later this week.