The Princess of Wales reportedly turned to her father-in-law the King prior to sharing her cancer diagnosis with the world.
Kate and King Charles have a very close bond. And it's been reported that they spent time together over an 'emotional lunch' at Windsor Castle, just 24 hours before her health battle was revealed. Just weeks earlier, Charles had shared the news of his own cancer diagnosis. Both royals are now undergoing treatment.
A source told the Sun: "It is highly unusual for just the two of them to sit down together like this. The King had already been made aware that the woman he calls 'my beloved daughter-in-law' had cancer. They would have had lots to discuss and share because just weeks earlier the King had begun his course of treatment and dealt with announcing his diagnosis.
"The King left his lunch feeling very emotional. They are very close and he thinks of Catherine as his daughter. There is no doubt there is a lot they can share and can use each other for support during their own deeply personal cancer battles."
A short time after the Princess's video was released, Buckingham Palace shared a statement on behalf of the King in which he expressed his immense pride in "Catherine for her courage in speaking as she did". He also confirmed that he had "remained in the closest contact with his beloved daughter-in-law throughout the past weeks".
Meghan Markle 'to unleash her own memoirs' as Prince Harry's drops next weekReflecting on the statement, royal expert Jennie Bond : "I noticed in the King's statement of support after Kate's broadcast he said he was in the 'closest contact with his beloved daughter-in-law'. I was struck by the fact that he didn't say close, but closest."
"There's no doubt that cancer has cemented an already strong relationship. It's very touching to think of Charles toddling down the corridor to see Kate when they were both in hospital. And it is understood that the King was left very emotional after their one-on-one lunch at Windsor Castle the day after she recorded her broadcast.
"There are so very few people in whom a senior royal can confide, certain that everything they say will be secure. I'm sure that both Charles and Kate have found it comforting to be able to discuss their emotions as well as the chemotherapy treatment and how it has made them feel."
Jennie added: "Of course Kate has her own father to turn to, so she's not looking for a father figure, but I think she has forged a genuinely affectionate relationship with Charles. And he makes no secret of the fact that he is enormously proud of her.
"After all, remember how Diana said Charles had always wanted a daughter. And he loves the grandchildren and now sees much more of them either at Windsor or Sandringham.
"It must be particularly tough for the children to know that both their grandfather and their mother are ill. But I'm sure Charles, like Kate, tries to shield them from that and carries on being a fun grandpa as much as he can in their tight knit little group."