Breaking: Pippa Middleton Helped Her Sister Kate Middleton Write Script for Cancer Announcement Video

Pippa Middleton helped her sister, Kate Middleton, write the emotional speech in which she announced that she was receiving cancer treatment.

The Princess of Wales, 44, is close with her younger sister, whom Russell Myers says helped organize her message in his new book, William and Catherine: The Monarchy’s New Era: The Inside Story, out March 10.

In March 2024, Princess Kate spoke from the heart in a video announcing that tests following her abdominal surgery weeks prior found cancer, that she was in the early stages of treatment and that it had taken her and Prince William time to explain the situation to their children, Prince George, 12, Princess Charlotte, 10, and Prince Louis, 7. Her speech closed with a powerful word to others facing cancer as she underscored, “You are not alone.”

According to an excerpt of William and Catherine published by The Mirror, “Catherine’s family rallied round, with her sister Pippa helping to write the script for the short video statement.”

The excerpt also described the magnitude of Kate’s cancer statement, saying, “Much like the announcement of the death of Elizabeth II, it felt like an earthquake whose reverberations were felt around the world.”

Pippa, 42, showed support for Princess Kate through several key public appearances in 2024, a year that Prince William described as “brutal” from “a personal family point of view” as his wife and father, King Charles, both began treatment for cancer.

Pippa joined her sister and niece Charlotte at the Wimbledon Tennis Championships that July, where Kate received a standing ovation as she entered the stadium. Kate’s supportive sister then stepped out again at her “Together at Christmas” Carol Service with other members of the Middleton family that December.

Princess Kate is close with her parents and siblings, who all live near her and William in Windsor. The Prince of Wales was by his wife’s side during her treatment and recovery journey, working to ensure that she didn’t feel “isolated” by the experience, a family friend said.

“He is a very reliable, strong person. She doesn’t feel isolated in this because of William, who is right beside her,” a longtime family friend exclusively told PEOPLE in 2024.

This is about supporting her and her feeling supported. It is a joint effort. She doesn’t feel isolated at all,” the insider said. “The nuclear family that they have created so well is an immense support not only to him but to Catherine too.”

Princess shared in September 2024 that she completed chemotherapy treatment and announced in January 2025 that she is in remission.