According to a royal biographer, there is a surprising reason for her Majesty's favouritism towards her younger children.
WATCH: Queen Elizabeth favoured Prince Andrew over Prince Charles
Queen Elizabeth IIandPrince Philiphad their first children,Prince Charlesand Princess Anne, in 1947 and 1950 respectively.
The royal couple waited a lengthy ten years before having Prince Andrew - who shares Princess Eugenie and Princess Beatrice with Sarah Ferguson.
Prince Andrew came into their lives after her Majesty and the Duke of Edinburgh resolved an enduring family feud, and for that reason, experts have always dubbed the Duke of York as the Queen's favourite child.
However, royal biographer Penny Junor says there may be another reason why Her Majesty prefers her second son.
In a shocking revelation, Junor wrote in her 2005 book “The Firm" that Prince Charles' nanny "was such a terrifying woman that the Queen kept out of the nursery while she was in charge."
This reduced the amount of time the British monarch spent with her first two children while raising them in Buckingham Palace.
Prince Andrew came into their lives after her Majesty and the Duke of Edinburgh resolved their issues.
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"By the time the Queen had the two younger children Helen Lightbody [their first Nanny] had gone and Mabel Anderson, her deputy and a much easier character, was in charge," the author explained.
"She and the Queen were good friends and brought the children up together."
Due to the mother-of-four having more contact with her two youngest children, she became notably closer with them.
"As a result the Queen had much more contact with Andrew and Edward than she ever had with Charles and Anne, and is still infinitely closer to them today."
Royal experts have always noted that the Queen is "infinitely closer" to Prince Andrew and Prince Edward than Prince Charles and Princess Anne.
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However, the Queen's children do not appear to share a close relationship - due to having different personalities.
Royal commentator Angela Mollard said on New Idea podcast "Royals” that the siblings are "very different, all four of them."
"They all get together and they’re all happy at family gatherings but there’s a lot of question marks over how much they see each other between times."
Mollard explained that during the years where Prince Charles, Prince Andrew, Sarah Ferguson and Princess Diana were at the forefront, things appeared to be "very strange."
"The relationship with Diana and Fergie – initially close – became quite strained.
"They all had a lot going on, they had a lot of broken relationships.
"Three of them having broken marriages, you wonder to what extent they were supports for each other."
