Lord Richard Percy British zoologist (1921-1989) (1921–1989) Parents Helen Percy, Duchess of Northumberland Alan Percy, 8th Duke of Northumberland Children Algernon Alan Percy Josceline Richard Percy Siblings George Percy, 9th Duke of Northumberland Elizabeth Douglas-Hamilton, Duchess of Hamilton and Brandon Hugh Percy, 10th Duke of Northumberland Lady Diana Percy Lord Geoffrey Percy Partners Sarah Norton Clayre Campbell