Princess Eugenie has remained Prince Harry's "bridge" to the Royal Family, according to a family friend.
The Duke of Sussex has drifted away from the Royal Family, however, he has remained close to Princess Eugenie.
A family friend of the Duke and Duchess of York, Dr Anthony Wallersteiner, is the chair of one of Sarah Ferguson's charities Street Child.
He was also the headteacher of Eugenie's husband Jack Brooksbank.
Princess Eugenie is very close to the Duke of Sussex
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Wallersteiner opened up about the bond between Eugenie and Prince Harry.
He said: "I think for Harry, Eugenie is his go-to royal.
"I think those cousins are very close, which is good, and I think Eugenie acts as a bridge between Harry and the rest of the family, which is really useful to have."
Prince Harry has drifted from the Royal Family
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It comes as senior members of the Royal Family fear that Princess Eugenie and her sister Princess Beatrice could be unintentionally leaking information to the Sussexes, according to a source.
The insider told Heat Magazine: "For the King, Camilla, and the Waleses, it's rather unfortunate that Eugenie and Beatrice are so close with the Sussexes."
They added: "[Beatrice and Eugenie are] still privy to a lot of what's happening inside Buckingham Palace, so there's a concern about what they're telling them, and what they could reveal - even unintentionally".
Prince Harry and Meghan Markle live in California
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Harry and Meghan are close with Jack and Eugenie
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Harry and Eugenie have remained close and are said to be in regular contact.
Eugenie has made frequent visits to California to see the Sussexes.
The royal cousins were spotted attending the Superbowl together in February 2022.