The sisters are in line for an appearance in the official carriage procession and Royal Enclosure at the racing festival this June following a disastrous few months.
While Kate, 44, is believed to be 'wary' of the York princesses due to the scandal surrounding their parents, her reservations may have begun much earlier.
Princess Anne's daughter and her former rugby union player husband, Mike Tindall, share close bonds with the Prince and Princess of Wales, as well as with Princesses Beatrice and Eugenie.
Newly released emails suggest Ms Ferguson had taken Princesses Beatrice and Eugenie to see the paedophile in July 2009, less than a week after he was freed from a Florida jail.
Sarah Ferguson visited Jeffrey Epstein with her two young daughters just five days after the disgraced financier was released from prison for child sex crimes.
Andrew Mountbatten-Windsor and Sarah Ferguson have been criticised for many things over the years, but no one could fault the way that they raised Princesses Beatrice and Eugenie.
While Princesses Beatrice and Eugenie (pictured) were surprise guests at the King's royal revelries at Sandringham, the disgraced former Duke of York was seen alone.
Mark Guiducci, who was appointed to the role amid much uproar over his close ties with Anna Wintour and her daughter, Bee Shaffer, is reportedly friends with the princesses.