There may be royally bad blood between Prince William and Andrew Mountbatten Windsor.

Allegedly, the pair’s feud stems from a “rude” comment the disgraced ex royal, 65, made about the Prince of Wales’ wife, Kate Middleton 43.

Author Andrew Lownie claimed in his royal biography, “The Rise and Fall of the Yorks,” that William, 43, supported his father King Charles III’s decision to strip Andrew of his royal titles and honors.

“He [William] also loathes Sarah [Ferguson], Andrew’s ex-wife, and can’t wait for the day when his father throws them both out,” an excerpt from a source noted in the book, per Daily Mail .

The Prince’s uncle was tied to the late convicted sex offender Jeffrey Epstein and had allegations of sexual misconduct against him. Andrew has repeatedly denied the claim

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