His candid stories and observations, particularly about Catherine's relationship with William, have captivated readers. James recalls the emotional moment before their engagement was made public in November 2010 when he and Catherine went for a quiet walk, realising that their lives were about to change dramatically.

They promised to support each other no matter what challenges lay ahead, a promise that has remained important, especially during Catherine's recent health struggles, when James has been a staunch supporter, highlighting their strong brotherly bond.

He also discusses how William positively impacted Catherine's confidence and strength, noting that he felt like part of the family. While studying at St Andrews University, William helped Catherine grow into the confident princess she is today.

James highlighted the couple’s unity through life’s challenges, including the joys of raising three children and supporting each other through difficult times such as the death of Queen Elizabeth II. One touching moment he shared was when Catherine revealed her condition.

James was quick to express his support on social media, demonstrating the family’s unity. Thankfully, Catherine has completed her difficult health journey and is looking forward to healing, with William by her side throughout her journey.