| Name | Relationship with Isabella de Taillefer | Civil | Canon |
|---|
| 20th great-grandson | XXII | 22 |
| Firth, Franklin Jones | 20th great-grandson | XXII | 22 |
| 21st great-grandson | XXIII | 23 |
| Firth, Hannah | 18th great-granddaughter | XX | 20 |
| 19th great-granddaughter | XXI | 21 |
| Firth, Hannah Hedge | 19th great-granddaughter | XXI | 21 |
| 20th great-granddaughter | XXII | 22 |
| Firth, Hannah Jones | 19th great-granddaughter | XXI | 21 |
| 20th great-granddaughter | XXII | 22 |
| Firth, Harry | 20th great-grandson | XXII | 22 |
| 21st great-grandson | XXIII | 23 |
| Firth, Henry Heberton | 21st great-grandson | XXIII | 23 |
| 22nd great-grandson | XXIV | 24 |
| Firth, John | 18th great-grandson | XX | 20 |
| 19th great-grandson | XXI | 21 |
| Firth, John | 19th great-grandson | XXI | 21 |
| 20th great-grandson | XXII | 22 |
| Firth, Lucas Smith | 19th great-grandson | XXI | 21 |
| 20th great-grandson | XXII | 22 |
| Firth, Maria Carpenter | 19th great-granddaughter | XXI | 21 |
| 20th great-granddaughter | XXII | 22 |
| Firth, Mary | 19th great-granddaughter | XXI | 21 |
| 20th great-granddaughter | XXII | 22 |
| Firth, Preston Carpenter | 18th great-grandson | XX | 20 |
| 19th great-grandson | XXI | 21 |
| Firth, Samuel | 18th great-grandson | XX | 20 |
| 19th great-grandson | XXI | 21 |
| Firth, Samuel Lloyd | 21st great-grandson | XXIII | 23 |
| 22nd great-grandson | XXIV | 24 |
| Firth, Samuel Robb | 20th great-grandson | XXII | 22 |
| 21st great-grandson | XXIII | 23 |
| Firth, Sarah | 19th great-granddaughter | XXI | 21 |
| 20th great-granddaughter | XXII | 22 |
| Firth, Sarah | 19th great-granddaughter | XXI | 21 |
| 20th great-granddaughter | XXII | 22 |
| Firth, Thomas | 18th great-grandson | XX | 20 |
| 19th great-grandson | XXI | 21 |
| Firth, Thomas T. | 21st great-grandson | XXIII | 23 |
| 22nd great-grandson | XXIV | 24 |
| Firth, Thomas Thompson | 19th great-grandson | XXI | 21 |
| 20th great-grandson | XXII | 22 |
| Fish, Edward Van Alstyne | 22nd great-grandson | XXIV | 24 |
| 23rd great-grandson | XXV | 25 |
| Fish, Louis Washburn | 22nd great-grandson | XXIV | 24 |
| 23rd great-grandson | XXV | 25 |
| Fish, Mary Washburn | 22nd great-granddaughter | XXIV | 24 |
| 23rd great-granddaughter | XXV | 25 |
| Fish, William Henry | Husband of the 21st great-granddaughter | | |
| Husband of the 22nd great-granddaughter | | |
| Fishbourne, Hannah | Wife of the 15th great-grandson | | |
