father-in-law’s coronation on May 6 and refused to curtsey for the monarch as she left Westminster Abbey.Appearing on “Dan Wootton Tonight” on Tuesday, Bower, 76, claimed that Middleton, 41, and her husband Prince William, 40, were not happy because the princess was only able to invite four of her family members while Camilla, 75, had 20 people present.The Post reached out to the Princess of Wales and Buckingham Palace for comment. The author further revealed that the people who helped change Camilla’s image from the King’s mistress to Queen were also snubbed from the high-profile event.“Camilla brought twenty Parker Bowles to the Coronation and there were four Middletons,” said Bower on the show later confirming that both of Middleton’s siblings were not allowed to bring their partners.