Maria Borrallo is possibly one of the most famous nannies in the world as she has the regal task of looking after the Cambridge's royal brood - Prince George, Princess Charlotte, and Prince Louis.
And as you might expect there are some strict rules when it comes to dealing with royality, as author Louise Heren found out after she spent a year at the famous Norland College in Bath, one of the country's top child care training centres, researching a documentary.
Norland was established in 1982 and trains some of the most prestigious nannies in the world.
According to their website, all Norland nannies are ‘expert practitioners’ and are ‘taught to adapt’ to their environments and respect how parents want their children cared for.
“The nannies are taught everything from defensive driving to security issues to how to care for a future king or queen,” royal commentator Victoria Murphy previously told ABC News.
Louise said she believes Kate and Maria would have a very close relationship.
"I imagine her relationship with Maria is very close and they collaborate greatly on the care of the children," she said.
"I've spoken to nannies who have worked with other royal families and life is pretty normal."
Other sources have previously revealed shouting was also "off limits" in the royal household.
And Kate and William will often step in when it comes to disciplining their children, sitting them down for a 'sofa chat'.
"The naughty child is taken away from the scene of the row or disruption and talked to calmly by either Kate or William," an insider told The Sun.
“Things are explained and consequences outlined and they never shout at them.
“Shouting is absolutely ‘off limits’ for the children and any hint of shouting at each other is dealt with by removal.”
Never miss a thing. Sign up to Yahoo Lifestyle’s daily newsletter.
Or if you have a story idea, email us at firstname.lastname@example.org.