Princesses Beatrice and Eugenie dealt brutal news as Trooping the Colour rumours shut down

Princess Beatrice and Princess Eugenie are set to miss out on joining the rest of the Royal Family during this year's Trooping the Colour as the York siblings are said to be kept at "arm's length" for "pivoting towards the dark side".

The Royal Family will put on a united front on June 15 for this year's official celebrations for King Charles's birthday, with Buckingham Palace revealing more details about the ceremony on Thursday.

Trooping the Colour is held every year as an official birthday event for the monarch - even though Charles's actual birthday is on November 14 - and it is considered a major fixture in the royal calendar.

Charles will take part in the Trooping the Colour ceremony but will inspect the soldiers from a carriage rather than on horseback.

Meanwhile, the Princess of Wales, who, like the King, is also undergoing cancer treatment, will miss a Trooping the Colour rehearsal next week, known as The Colonel's Review.

Whilst Princess Kate is understood to be considering making a surprise appearance on the Buckingham Palace balcony this year, it remains unclear whether she will attend the main ceremony on June 15 at all.

However, royal sources said other members of the firm are expected to attend the main event but the attendance would mirror that of last year, when only working members of the Royal Family were present.

That means the princesses of York are unlikely to make an appearance on the balcony this year - as this is typically restriction to just senior working royals.

It comes after a royal expert claimed Sarah Ferguson's daughters are being kept at "arm's length" by Kensington Palace after getting closer to Prince Harry and what the Palace has allegedly described as the "dark side".

Royal author Tom Quinn told the Mirror: "As his two cousins pivot towards his exiled brother, and with his wife and father incapacitated by illness, William feels increasingly isolated and in the closed hothouse atmosphere of Kensington Palace and Windsor he is bound to feel increasingly paranoid.

"For William it's a question of loyalty – as Beatrice and Eugenie have got closer to Harry William has decided to keep them very much at arm’s length. The two sisters are known to be close to William's brother, Harry, with the Duke of Sussex thinking his cousins can 'sympathise' with him the most."

Mr Quinn alleged that this has created "serious concern" in the Wales's household.

He said: "Beatrice and Eugenie are moving across to what one Kensington Palace official described as 'the dark side'."