The brief split is highlighted in a new biography of Duchess Catherine, which highlights the important role Carol Middleton played in her daughter's life during this time. When Katherine unexpectedly cancelled plans for a New Year's Eve gathering arranged by the Middleton family, she let it be known that something was wrong. Media speculation surrounding a potential royal engagement added to the pressure, prompting William to end the relationship over the phone. According to the author, the emotional conversation revealed they were emotionally out of sync.

Understanding the intense scrutiny her daughter faced, Carol encouraged Catherine to focus on her personal development, career, and interests. This time away eventually allowed Catherine to develop independence, strengthening her relationship with Prince William when they reconciled later that year. Carol’s support during this tumultuous time was instrumental in helping Catherine navigate her emotions and become stronger. She quickly arranged a trip to Dublin for her grieving daughter, allowing her to escape the media spotlight. Shortly afterwards, Catherine went on holiday to Ibiza with a friend, but the trip attracted significant media coverage, leading the press to dub them the “Sizzler Sisters” due to the numerous paparazzi photos of them at nightclubs.

The strong bond between Catherine and Carol remained evident throughout Catherine’s journey to becoming a royal. Carol’s influence has played a significant role in shaping Catherine into the calm and resilient individual she is today. During some of the most difficult moments of her life, Carol has been a pillar of support. Back in March 2024, Princess Catherine publicly announced that she was undergoing preventative cancer treatment following abdominal surgery. The revelation shocked many, but once again, Carol provided emotional and practical support, staying by Catherine’s side to help care for her grandchildren Prince George, Princess Charlotte and Prince Louis to ensure their routines remained stable.

This allowed Catherine to focus on her recovery without the added stress of childcare responsibilities. Prince William’s unwavering commitment to his wife and her family was evident during his father’s coronation. He insisted that the Middleton family be prominently included in the event, a gesture that brought Catherine to tears. Royal insiders say William directly requested that Katherine's family be seated in a prominent position, in stark contrast to the way other extended royals are treated.

For example, only two representatives from the Queen Mother's family attended, while Prince Philip's relatives were represented only by the Countess Mountbatten. The inclusion of Michael and Carol Middleton, along with Katherine's siblings James and Pippa, marked a significant departure from traditional royal practice. The decision underscored the changing nature of the royal family since the reign of Queen Elizabeth II, and underscored the importance William placed on ensuring his wife's family received the recognition they deserved.