The impression Catherine left behind was that of a caring, generous grandmother and great-grandmother. She revealed that the Queen showed her affection for her great-grandchildren, especially Prince Lewis, through an important act. If Queen Elizabeth II had not changed an important royal rule, her great-grandchildren would have had a very different name. Six-year-old Prince Lewis, known for his playful personality and antics at royal events, is now known as Prince Lewis Arthur Charles. However, without the Queen's intervention, he would not have had the title of Prince. In 1917, King George I introduced a rule limiting royal titles.

Under his decree, only the children of the monarch and their direct descendants are automatically given the title of Prince or Princess, along with the style “His Royal Highness” (HRH). This means that great-grandchildren of the monarch do not receive royal titles. Under this rule, Prince Lewis, as a great-grandson of Queen Elizabeth II, would not be called a prince. Instead, he would be known as “Sir Lewis Mountbatten Windsor”, reflecting the family name of the untitled royals. In 2012, before Prince George was born, Queen Elizabeth II issued a formal statement changing this rule.

She extended the HRH title and the titles of Prince or Princess to all of Prince William and Princess Catherine’s children. This decision ensures that Prince George, Princess Charlotte and Prince Lewis all have royal titles, reflecting their direct link to the future monarch. Without the change, only Prince George, as the firstborn and heir apparent, would have been granted the title of prince, while Charlotte and Lewis would not. In a documentary to mark the Queen's 90th birthday in 2016, the royal mother of three shed light on the Queen's focus on family life rather than her duties as head of state.

At the time, Catherine said that Prince Lewis had not yet been born, but it is possible that the Queen has done similarly thoughtful things for all of her great-grandchildren. The princess explained that whenever they came to stay with the Queen, she always prepared a special surprise for the children. "She always left a little gift or something in their room when we came to stay," which shows her love for her family. She also took great care of Charlotte, who many have commented resembled the Queen when she was a child. After Charlotte was born, she revealed a sweet nickname George had for his great-grandmother: "I think she loved Charlotte, always watching what I was doing. George was only two and a half and called her 'Gong Gan'."

In 2010, when the Cambridges got engaged, Catherine revealed in an interview that the first time she met the Queen was when William wasn't there. Their first meeting took place in 2008 when Peter Phillips, Princess Anne's son, married Autumn Kelly, but William was abroad. Catherine still attended the wedding alone. William explained his wife's meeting with her grandmother: "She was very welcoming. She knew it was an important day and everything was going on with Peter and Autumn, and she'd wanted to meet the Princess for a long time, so it was nice of her to come and say hello." Despite their royal status, Prince William and Princess Catherine are committed to giving their children as normal a life as possible. This approach supports William and Catherine's goal of combining royal tradition with a close and approachable childhood.