William de Bostock was born circa 1334 in Bostock, Cheshire, England to Adam de Bostock (c1319-c1360) and Jane De Brereton (c1320-c1369) and died circa 1390 Bostock, Cheshire, England of unspecified causes. He married ? de Multon .
Siblings
| Name | Birth | Death | Joined with |
| William de Bostock (c1334-c1390) | 1334 Bostock, Cheshire, England | 1390 Bostock, Cheshire, England | ? de Multon |
Children
| Name | Birth | Death | Joined with |
| Adam de Bostock (c1346-c1374) | 1346 Bostock, Cheshire, England, United Kingdom | 1374 Bostock, Cheshire, England, United Kingdom | Margaret de Whittenhall (c1348-c1420) |