In an exclusive interview with PEOPLE at Althorp, Princess Diana’s brother opens up about telling her sons about his deeply personal new memoir

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Charles Spencer tells PEOPLE he kept his new memoir about Princess Diana secret from some of her closest family members while writing it

Spencer says he told Prince William, Prince Harry and his sisters, Lady Sarah and Lady Jane, about the book at “exactly” the same time

While he says his sisters are “still digesting” the book, Spencer adds, “I can say that Harry is completely fine about it”

Charles Spencer kept his deeply personal memoir about Princess Diana under wraps — even from some of…

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