Anne Tree noblewoman; British philanthropist and prison visitor (1927–2010) (1927–2010) Parents Mary Cavendish, Duchess of Devonshire Edward Cavendish, 10th Duke of Devonshire Children Siblings William Cavendish, Marquess of Hartington Mary Cavendish Andrew Cavendish, 11th Duke of Devonshire Elizabeth Cavendish Partners Michael Lambert Tree