The gardens sport a coronet of dew under a rare Scottish sun, but Prince Charles remains indoors, doing what the heir to the thrones of the United Kingdom, Australia, Canada, Jamaica and 12 other Commonwealth realms has always done — his duty. He's a champion at enduring windy speeches, toes scrunched in his shoes to keep awake. But this particular duty lies closer to his soul: he's teaching his firstborn to wield a sword. Prince William needs to master the key move of granting knighthoods, laying a blade on the shoulders of recipients, ideally without inflicting injury. So on Sept. 26, Charles interrupts a family visit at his Scottish residence Birkhall with his son, wife Camilla, daughter-in-law Kate and the youngest Windsor, baby George, to stage a dress rehearsal.
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