Kate's "circle of trust is tiny" as the Princess of Wales leans on Carole, Pippa and James, royal sources have claimed.
The mother-of-three announced in March she had begun a course of preventative chemotherapy via a video message.
Therefore, Kate, 42, has not appeared in public at all in an official capacity during 2024 as she focuses on her recovery.
Friends of the Prince and Princess of Wales have spoken out about Kate avoiding any "stress or anxiety" for the time being, as she rests at Adelaide Cottage in Windsor.
Kate announced she had begun a course of preventative chemotherapy earlier this year
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A friend of Kate and William said: “The key thing for her now is avoiding any kind of stress or anxiety and just getting on with the business of getting better.
"They will bail out and be off to Sandringham the moment school breaks up.”
The friend added that Kate has preferred to lean on and confide in her family rather than her and William’s circle of friends.
Many of them will be at the Duke of Westminster’s wedding next month, along with Prince William who is acting as best man during the service.
Carole Middleton and Michael Middleton both live in BuckleburyPAThey continued to tell The Daily Beast: “The circle of trust is tiny. She has been surrounded by Carole and Michael, and (sister) Pippa and (brother) James have obviously been there for her as well.
"They are an incredibly tight family, and Catherine feels absolutely confident relying on them. They have been there for her for decades and never let her down.”
GB News has approached Kensington Palace for comment.
During her video address, Kate said: "In January, I underwent major abdominal surgery in London and at the time, it was thought that my condition was non-cancerous. The surgery was successful. However, tests after the operation found cancer had been present.
James Middleton and Pippa Middleton both live in BerkshirePALATEST ROYAL NEWS:
Kate shared her cancer diagnosis with the world via a video message in MarchPA "My medical team therefore advised that I should undergo a course of preventative chemotherapy and I am now in the early stages of that treatment."
The Princess of Wales continued: "This of course came as a huge shock, and William and I have been doing everything we can to process and manage this privately for the sake of our young family.
"As you can imagine, this has taken time. It has taken me time to recover from major surgery in order to start my treatment.
"But, most importantly, it has taken us time to explain everything to George, Charlotte and Louis in a way that is appropriate for them, and to reassure them that I am going to be ok."