Prince William is 'counting on Carole Middleton' as he takes care of Princess Kate amid cancer battle

In his new book, Catherine, Princess of Wales, royal commentator Robert Jobson wrote about William's affection for his mother and father-in-law.

While promoting the book, he said: "[William] was given another family with Carole and Michael Middleton from a very early age.

Despite some ups and downs during the early days of William and Kate’s relationship, her parents "still stayed very loyal to him".

Jobson added: "I think he counts on Carole and Michael very much as his second mum and dad, really."

He also explained the importance of William and Kate’s 2022 move to Adelaide Cottage in Windsor, just a stone’s throw away from Windsor Castle.

The author continued to tell Us Weekly: "Although their offices and staff remain at Kensington Palace, the move from London suits the lifestyle of their growing family."

He added that William and Kate’s "low-key life" is working for them.

Discussing the move with the publication, Jobson explained that living in Adelaide Cottage also allowed William and Kate, both 42, to be “closer” to King Charles III as well as Carole, 69, and Michael, 75.

The author explained: "That helps an awful lot. I think that she’s very family orientated, always has been.

"In that respect, I think [it] has helped William, who — like Prince Harry — struggled with the loss of his mother."

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Jobson went on to say that, from his perspective, William learned a lot about being a parent from his own family.

But it was Carole and Michael who demonstrated "that whole idea of how important the family unit is and must stay at the core of everything they do".

Catherine, Princess of Wales is set to be released on Tuesday, August 6.