“Charles on the other hand has always shown signals that suggest self-pity and inner anguish.”

When younger, the expert highlighted many differences in how the two royals behaved.

“Growing up he and Anne perfectly defined the chalk-and-cheese sibling relationship, with Charles suffering through his school years while Anne just got on with things,” Judi continued.

“As Charles adopted a more academic approach to the life of a future King, Anne became a successful, no-nonsense sportswoman alongside her regular royal duties.”

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The expert claimed the royal siblings have not shown many signs of a close relationship.

However, this is something that may have changed in recent years.

“There were very little if any relationship-defining poses of the pair over the years,” Judi said.

“But recently there have been clues that suggest they might have been becoming closer. This might have been prompted by need.”

“Given their past histories, with Anne having dated Camilla’s ex husband, the relationship between Anne and Camilla might have been difficult, creating a bigger rift between Charles and his sister,” Judi continued.

“But in fact the two women seem very tolerant of one another to the point of often looking like old friends, and this might have created an easing in the relationship between the siblings.

“Anne and Charles will probably never be the closest brother and sister, but they are beginning to look as though shared goals in terms of their love and sense of duty to their mother and a desire to sustain the image of the royal firm have brought them closer together.

“Also, along with the obvious affection that Anne’s daughter Zara Tindall seems to have for her uncle Charles.”

The royal line of succession – who outranks who?

The line of succession to the British throne dictates the order in which each member of the Royal Family would ascend to the throne.

It is also seen as a ranking of importance with the head of the line, the Queen, taking the place of ruler.

Older children come before younger children. Traditionally boys came before girls, but this law was changed on 26 March 2015 before the birth of Prince William’s first child.

Incredibly, Catholics are still excluded from the line of succession, as are children born outside of wedlock.

The royals, who usually stick to a strict protocol when appearing in public, often arrive at events in ascending order of importance, with the most important royal arriving last.

Prince Charles, 72, is currently first-in-line to the British throne, followed by Prince William, 38, his oldest son.

Then comes Prince William’s children, George, seven, Charlotte, five, and Louis, two, and they are followed by Prince Harry, 36. Prince Harry is succeeded by his son Archie Harrison, born in May 2019.