Despite growing concern, the King reportedly remains steadfast in his commitment to fulfilling his royal duties for as long as his health allows. Meanwhile, Prince William has been “quietly preparing to step up fast,” the insider added, as “the illusion of perfect health is collapsing.”

The Prince of Wales has gradually taken on a more prominent role within the monarchy, balancing his father’s workload and representing the Crown at key engagements.

Still, William has reassured the public that his father’s treatment is moving in the right direction. In a recent interview with Eugene Levy for Apple TV, he shared an encouraging update: “Everything is progressing in the right way, which is all good news.”

As the King continues his private fight, royal watchers say the coming months will be critical in determining how the monarchy adapts — and how soon the next generation may be called to take on a greater role.