Catherine, Princess of Wales has always been a big sister figure. She was one year old when her little sister, Pippa Middleton, came along, and five when her baby brother, James Middleton, was born. Their relationship with one another only seems to have strengthened as they've entered the public eye,

As the Princess of Wales turned to leave the annual Service of Remembrance on Whitehall after making a poignant return to royal duties, the Duchess of Edinburgh, who had watched the emotional event firmly at her side,