William Johnson Mangnall was born in Bolton in 1890 and was the son of William Mangnall (1863) and Margaret Johnson. In 1891 he was living at 26 Brandon Street, Bolton. In 1901 he was living at 23 Glynn Street, Bolton.

Sources
• 1. 1891 Census. 26 Brandon St, Bolton. William Johnson Mangnall. Son. Age 4 months. Born Bolton. • 2. 1901 Census. 23 Glynn St, Bolton. William J. Mangnall. Son. Age 10. Born Bolton.