Following Kate's announcement about her cancer diagnosis and ongoing treatment, reports indicate that Prince Harry privately reached out to Kate and William. While the details of their conversations remain undisclosed, it is believed that Harry had a different endearing nickname for his sister-in-law rather than simply calling her "Kate," as reported by The Mirror.
Interestingly, Kate's choice of names has evolved over time. She reportedly began using the nickname "Kate" during her university years, while previously preferring to be addressed by her full name, Catherine. It appears that Harry, during his close bond with his brother's wife, continued to refer to her as "Cath."
Kate has previously mentioned that she doesn't mind which name people use to address her. Alongside Catherine, Kate, and Cath, her husband affectionately calls her "babe" and "darling," while her children refer to her as "mummy." During her school days, she was known as "Squeak," reportedly inspired by the name of a guinea pig.
Both Kate and her younger sister, Pippa, had pet guinea pigs named Pip and Squeak, respectively. They later adopted nicknames derived from their pets, with Pippa becoming Pip and Kate being referred to as Squeak.
It is said that Harry was deeply saddened by the news of Kate's diagnosis before making the decision to reach out to her privately.
