Princess Eugenie and Princess Beatrice 'caught in the middle of deep Royal Family rift'

The duo have also stepped up with public engagements following King Charles and Princess Kate's ill health.

Eugenie and Beatrice both attended William's first Garden Party of 2024 without Kate - who is undergoing cancer treatment - in a "show of solidarity with the heir to the throne who is currently not on speaking terms with his errant brother".

However, Eugenie is known to be a favoured cousin of Prince Harry and appeared in his bombshell Netflix documentary in 2022.

There has also been speculation that the Duke of Sussex visited Eugenie at her home in the Algarve, Portugal in September last year.

"It is perfectly possible to be involved in a deep public family rift and be on amiable terms with all involved," Fitzwilliams told the MailOnline.

"Princess Eugenie, who with her husband Jack Brooksbank is mainly based in the Algarve, had Harry and Meghan as visitors.

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"They've got on over the years, and she and her husband Jack Brooksbank were resident for a period at Frogmore Cottage whilst the Sussexes were in California before they were evicted."

The royal sisters have also displayed support for William and the monarch, despite the rift between the Sussex and Wales families.

"She posted on Instagram that she was 'delighted to support my family', these are very meaningful words at the moment," Fitzwilliams added.

The royal expert said the depth of the rift between King Charles and Harry came to light when he and his father did not meet during his last visit.

Fitzwilliams concluded: "It would be of benefit to all if it were resolved.

"But until that happens Beatrice and Eugenie, who conceivably could act as go-betweens, are undoubtedly supporting William and are likely to give him their full backing if there are further attacks by the Sussexes on the royal family."

Another royal insider suggested that Princess Beatrice, Princess Eugenie and Zara Tindall "want to support Prince William and King Charles" unique circumstances' and are "closer than most cousins".