He married Caroline Macmillan , a daughter of Harold Macmillan and Lady Dorothy Cavendish , a daughter of the 9th Duke of Devonshire .
Head entity: 9th duke of devonshire Q2411883 19 20 21 22
Tail entity: lady dorothy cavendish Q3037179 11 12 13
Relation (head \u2192 tail): P22
Inverse relation (tail \u2192 head): P40