Sources tell People Prince Harry will return to the UK within the next few days as his father, King Charles, is undergoing treatment for cancer. Charles is understood to have personally informed both Harry and his brother, Prince William, of his diagnosis, as well as his three siblings, Princess Anne, Prince Andrew, and Prince Edward. Since stepping back from roles as working members of the royal family in 2020, Harry and his wife, Meghan Markle, have lived in California with their two children, Prince Archie, 4, and Princess Lilibet, 2. He has been back several times, however, including for t…