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A public row broke out between Buckingham Palace and Charles Spencer, Princess Diana's brother, over claims made in his new book. King Charles issued a rare personal response to one of the claims made about him, while palace officials pushed back on other assertions in a war of words that threatened to overshadow a busy royal calendar featuring King Charles and Princes William and Harry all attending separate public events on the same day. The dispute has reignited scrutiny of the royal family's relationship with Diana's legacy and her surviving relatives, adding to a string of recent controversies surrounding the monarchy.