Children must be well behaved
Kate is expected to make sure her children are well behaved at all times. It is done with special training and briefing on how to conduct themselves when in public. While one can expect mild-mannered children, the royal couple are parents to three children under the age of five, which is likely eventful. We believe William and Kate have had to put in a lot of effort to train their children to behave elegantly in public. It is also done with the help of well-trained Nannies. After all, being a Duchess, the task cannot be hers alone, so the children are managed by Nannies.
The Duchess seems to have everything under control, at least in public. Her children, George, 4, and Charlotte, 2, are always impeccably dressed and show exemplary demeanor in front of others. They are well-trained and well-mannered. They know how to behave in front of the photographers and the public. Children are aware of their dismissal from events and public places in case of bad behavior and whims. There are strict rules of behavior, even for royal children. If the little prince or princess is too naughty, they are left at home for an official ceremony. This is how they are trained so well.