When Prince Harry sues Prince William for “wilful and malicious sibling rivalry,” the sensational claims from Spare finally face their day in court. But as the proceedings unfold, it’s not just the brothers on trial - suddenly the very suitability of Wills and Kate as Britain’s future King and Queen is thrown into doubt.The timing couldn’t be more disastrous. Charles and Camilla are preparing to abdicate for a blissful retirement in Mustique, leaving the throne dangerously...