currently battling an undisclosed form of cancer amid estrangement from the Duke and Duchess of Sussex ,who are living in Montecito, Calif.As Charles undergoes treatment for the disease, royal columnist Sarah Vine says Anne, 73, is the “secret weapon” who could reunite the feuding family. In an interview with Jo Elvin, Vine hailed the Princess Royal as the answer to all the royal family’s problems, according to the Express.