| Male William Demontagu |
| Female Countess of Salisbury Katherine Degrandison |
| Birth | 1304 | Ewyas Harold, Herefordshire, England, United Kingdom |
| Death | 23 Nov 1349 | Bisham, Berkshire, England, United Kingdom |
| Burial | ||
| Father | Baron of Grandison William De Grandison | F4340 Group Sheet | |
| Mother | Sybil Tregoz | F4340 Group Sheet | |
| Female + Sibyl Demontagu |
| Birth | 1330 | , Somerset, England, United Kingdom |
| Death | 30 Jan 1344 | , Somerset, England, United Kingdom |
| Burial | ||
| Spouse | Edmund Fitz Alan | F4353 | |
| Marriage | Jul 1349 | , Somerset, England, United Kingdom |