His father was Prince Henry , Duke of Gloucester ( 1900–1974 ) , the third son of King George V and Queen Mary .
Head entity: king george v Q269412 17 18 19
Tail entity: prince henry, duke of gloucester Q117174 3 4 5 6 7 8
Relation (head \u2192 tail): P40
Inverse relation (tail \u2192 head): P22