Prince George’s favorite uncle is not Prince Harry.

On Monday, Prince William and Kate Middleton’s eldest son celebrated his 6th birthday. An insider revealed some juicy details about the third-in-line to the throne including his favorite uncle who surprisingly turned out to be someone else and not Prince Harry.

According to Sofie Jackson of Daily Star, Prince George is a huge fan of the former England rugby star, Mike Tindall. Mike is the husband of Princess Anne’s daughter Zara Phillips Tindall.

“He hits it off best with those people who are most comfortable in their own skin,” the source said.

“His favourite uncle is Mike Tindall, because he larks about and never takes himself too seriously.”

The Cambridges and the Tindalls are very close. A few months ago, they were spotted enjoying a family day out together when they attended the Burnham horse trials in Norfolk during the Easter holidays.

On the said outing, Prince William had his goddaughter Mia Tindall on his shoulder. Meanwhile, Prince George perched on Mike’s shoulder. Middleton was also photographed giving her daughter, Princess Charlotte, a piggyback ride.

According to Mike, the young Tindalls and Cambridges are forming a friendship and he is happy to see them enjoying their time together. He was hoping that the kids will continue to share a close bond as they grow up.

“They’re all quite close in age and hopefully they’ll grow up as good friends,” he said.

Prince George is also close to his aunt Zara. The two were photographed doing high five. Another shot captured the two royals hugging each other.

Meanwhile, Prince Harry was a great uncle to the Duke and Duchess of Cambridge’s kids before he welcomed his son, Archie. According to Mike, the Duke of Sussex loves to play with the kids.

Prince Harry also recognized the fact that he is way down the line of succession because of his nephews and niece but he didn’t mind this because for him, “they are the most amazing things ever” and “I could never wish them away.”

Prince William and Prince George
Pictured: Prince William and Prince George at a children's party for Military families during the Royal Tour of Canada on Sept. 29, 2016 in Victoria, Canada. Getty Images/Chris Jackson