Beardsley was born in Brighton, England, on 21 August 1872, and christened on 24 Oct 1872. His father, Vincent Paul Beardsley (1839–1909), was the son of a tradesman; Vincent had no trade himself, however, and instead relied on a private income from an inheritance that he received from his maternal grandfather when he was twenty-one years of age. Vincent’s wife, Ellen Agnus Pitt (1846–1932), was the daughter of Surgeon-Major William Pitt of the Indian Army. The Pitts were a well-established and respected family in Brighton, and Beardsley’s mother married a man of lesser social status than might have been expected. Soon after their wedding, Vincent was obliged to sell some of his property in order to settle a claim for his breach of promise” from another woman who claimed that he had promised to marry her. At the time of his birth