July 20, 2017 - Source: Chris Jackson/Getty Images Europe
8. Absolutely No Shouting
No matter a child's formal training, they will sometimes have a hard time processing their big feelings and end up shouting in frustration. William and Kate have a special rule during moments like that. A source told The Sun, "Shouting is absolutely ‘off limits’ for the children and any hint of shouting at each other is dealt with by removal." The parents will then get down to the child's level and introduce a "chat soft."

"The naughty child is taken away from the scene of the row or disruption and talked to calmly by either Kate or William," the source explained. "Things are explained and consequences outlined and they never shout at them."