Percival married Mabel Gertrude Adams on 25 Jun 1907 in St. Paul's, Brentford, Middlesex, England. Mabel (daughter of William Stanley Adams, MD, CM and Susy Blanche Mary Hugo) was born about 1881 in Jersey, Channel Islands; died between 1 Apr 1967 and 30 Jun 1967 in Cheltenham District, Gloucestershire, England. [Group Sheet]