As Prince George, Princess Charlotte, and Prince Louis grow older, they become more involved in public events, leading royal watchers to regularly comment on their commendable behavior. However, if Kate notices they're behaving badly, she uses four specific words to address their behavior.

In his book Gilded Youth: An Intimate History of Growing Up in the Royal Family, royal expert Tom Quinn notes that during the Queen's Platinum Jubilee celebrations, when Prince Louis was seen sticking his tongue out at his mother, Kate's response was praised by a panel of experts.

It's been noted that she uses a "secret code" to reassure the children, often saying "take a break." A former staffer points out that the children understand that these words mean more than they might expect. However, Kate is said to be “not too worried” about their behaviour, as she enjoys seeing her children being themselves. A source commented on Louis’ cheerful nature, noting that he can’t contain his excitement at a public event. According to the source, Kate loves seeing her children happy.

Furthermore, William and Kate even humorously acknowledged Louis’ playful behaviour after the Queen’s Platinum Jubilee in a thank you letter after the event, putting him in the spotlight and acknowledging their joy. They expressed their gratitude for the celebration weekend, highlighting the special atmosphere created by the gathering and specifically mentioning how much fun Louis had.

William and Kate prioritize open communication in their approach to parenting. When their children face difficult emotions or temperamental issues, they prefer to “chat on the sofa” rather than isolate them. This approach ensures that the child is not left alone to deal with their emotions and receive support to understand the situation. Furthermore, the couple adhere to a strict “no yelling” rule; any child who raises his voice will be gently taken aside, while William and Kate remain calm, even during times of discipline.