William Henry Gates was born 22 January 1860 in Warrington Township, Bucks County, Pennsylvania, United States to Joseph Stanton Gates (c1806-1863) and Martha P. Sattlelee (1823-1905) and died 30 April 1923 Seattle, King County, Washington, United States of unspecified causes. He married Rebecca Eppinhauser (1869-c1920) 19 September 1888 in King County, Washington, United States.
Siblings
| Name | Birth | Death | Joined with |
| William Henry Gates (1860-1926) | 22 January 1860 Warrington Township, Bucks County, Pennsylvania, United States | 30 April 1923 Seattle, King County, Washington, United States | Rebecca Eppinhauser (1869-c1920) |
Children
| Name | Birth | Death | Joined with |
| Florence Martha Gates (1889-1987) | |||
| William Henry Gates (1891-1969) | 14 March 1891 Bremerton, Kitsap County, Washington, United States | 17 August 1969 Bremerton, Kitsap County, Washington, United States | Lillian Elizabeth Rice (1891-1966) |
| Pearl Ann Gates (1895-) | |||