Nannies are an integral part of life within the royal family, helping members of The Firm with their little ones while they're out and about on official duties.
Given how much time they spend with the young royals, it's no surprise that they often become part of the family. But this isn't always a good thing, as they Queen discovered when she was forced to fire one of Prince Charles ' nannies for overstepping the mark.
Royal author Bryan Kozlowski shared the story in his book Long Live the Queen! 13 Rules for Living from Britain's Longest Reigning Monarch.
According to Bryan, the nanny was too discerning about the eight-year-old's meals for the Queen's liking.
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He writes: "It's said she took pleasure in tormenting the Palace kitchen with her exacting standards.
"Dishes for young Charles were constantly being refused or remade based on little more than the nanny's personal whims. The Queen eventually had enough and fired her."
But it was one particular incident that was reportedly the final straw for the Monarch, and it all started with a "special pudding" - or lack thereof.
Kozlowski writes: "In 1956, the Queen sent the nursery a simple request that Charles, then eight years old, be given a special pudding she thought he might like.
"[The nanny] refused, crossed the dessert from the menu, and incurred the Crown's wrath. Nobody crosses out the Queen's request."
When Prince George was just eight months old, Duke and Duchess of Cambridge hired one of the best nannies in the country, Maria Borrallo.
Kate and William hired Maria, who trained at the prestigious Norland College, in Bath, back in 2014 and since then she has lived at Kensington Palace and accompanies the family when they go on visits and royal tours.
As part of the training given at her college, there is one word Maria is banned from saying whenever she's at work.
On top of learning skills like self-defence and defensive driving, nannies are also reportedly taught not to say a particular word in front of children, according to author Louise Heren who spent a year at the college researching a documentary.
Speaking to The Mirror, she revealed that the women at Norland are taught never to say - kids.
Instead, George, Charlotte and Louis should always be referred to as children or by their names.
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