Task: Question Generation
Input (English): Context : Henry Percy Douglas was born at Dacre Hill, Higher Bebington, Cheshire, on 1 November 1876, the second son of Admiral Sholto Douglas (1833--1913) and his first wife, Maria Louisa, the only daughter of William Bickford, of Stonehouse, Devon. 
Subject : Percy Douglas 
Relation : military branch
Output (English): In what military branch did Percy Douglas serve?