In an unexpected development within the British royal household, King Charles has reportedly voiced severe disapproval of Prince William and Kate's children, labeling them as pampered and unruly, according to insider reports obtained by GLOBE.

The 74-year-old monarch, in a significant family confrontation, has allegedly advised the Duke and Duchess of Cambridge to manage their children's public demeanor more strictly, threatening to exclude them from future royal events if they fail to do so.

"A source within the palace shares that Charles and Queen Camilla are not amused by the young royals' conduct, which they consider petulant. They are seemingly frustrated that the grandchildren often outshine them," said a palace informant.

A private meeting was set up by Charles with William, where he delivered the ultimatum to improve his children's conduct.

"William was deeply offended by Charles' critique of his children and defended them as well-adjusted individuals, which led to a heated argument," the source revealed.

This purported feud adds to the existing tension within the family following the Prince Harry and Meghan controversy.

The discord reportedly intensified after the royal children - Prince George, 9, Princess Charlotte, 8, and Prince Louis, 5 - attended the Trooping the Colour ceremony on June 17, marking the King's official birthday. The children's high-spirited behavior once again drew the spotlight away from Charles.

Louis was the center of attention during the event, causing amusement with his dramatic reactions to the ceremony's horse parade and the Royal Air Force flyover.

Princess Charlotte, too, invited criticism from the senior royals during the event after a public admonishment from her great-aunt, Duchess of Edinburgh, Sophie.

Despite William, 41, acknowledging his children's spirited demeanor, he resolutely defends their behavior. He has confessed to Charlotte being particularly challenging as she entered her sixth year, demonstrating an independent streak.

"Charlotte thinks she's 16 and asserts, 'I'll do what I want,'" he shared.

However, William remains undeterred by his father's traditionalist views on discipline. The source revealed, "He insists that he and Kate are raising well-adjusted, beloved children who will secure the future of the monarchy."