William James Winslade was born 1865 in Farnham, Surrey, England, United Kingdom to William Winslade (1840-1912) and Elizabeth Hack (c1843-) and died 1957 Sandown, Isle of Wight, England, United Kingdom of unspecified causes. He married Mary Chase Russell (1869-1894) 1892 in Farnham, Surrey, England, United Kingdom. He married Emily Luff (c1869-) 1895 in Farnham, Surrey, England, United Kingdom.
Children
| Name | Birth | Death | Joined with |
| Percy William Winslade (c1894-) | |||
| Name | Birth | Death | Joined with |
| Dorothy Maud Winslade (1898-) | |||
| Beatrice May Winslade (1900-1976) | |||