| Name | Relationship with Natalie Seiwell | Civil | Canon |
| Fitz William, Emma | 31st great-grandaunt | XXXV | 34 |
| Fitz William, Guillaume | 31st great-granduncle | XXXV | 34 |
| Fitzalan, Agnes Fitzrandolph | 26th great-grandmother | XXVIII | 28 |
| 3rd cousin 30 times removed | XXXVIII | 34 |
| Wife of the 5th cousin 26 times removed | | |
| Fitzalan, Alan | 29th great-grandfather | XXXI | 31 |
| Fitzalan, Alice Plantagenet | 19th great-grandmother | XXI | 21 |
| 22nd great-grandmother | XXIV | 24 |
| 3rd cousin 21 times removed | XXIX | 25 |
| 4th cousin 22 times removed | XXXII | 27 |
| 3rd cousin 24 times removed | XXXII | 28 |
| 4th cousin 25 times removed | XXXV | 30 |
| 8th cousin 21 times removed | XXXIX | 30 |
| 8th cousin 22 times removed | XL | 31 |
| 8th cousin 23 times removed | XLI | 32 |
| Wife of the half 2nd cousin 21 times removed | | |
| Wife of the half 3rd cousin 21 times removed | | |
| Wife of the 3rd cousin 21 times removed | | |
| Wife of the half 2nd cousin 24 times removed | | |
| Wife of the half 3rd cousin 24 times removed | | |
| Wife of the 5th cousin 20 times removed | | |
| Wife of the 3rd cousin 24 times removed | | |
| Wife of the 4th cousin 22 times removed | | |
| Wife of the 5th cousin 23 times removed | | |
| Wife of the 4th cousin 25 times removed | | |
| Wife of the 10th cousin 19 times removed | | |
| Wife of the 8th cousin 23 times removed | | |
| Wife of the 9th cousin 22 times removed | | |
| Wife of the 9th cousin 24 times removed | | |
| Wife of the 10th cousin 22 times removed | | |
| Wife of the 8th cousin 26 times removed | | |
| Fitzalan, Avelina | 25th great-grandmother | XXVII | 27 |
| Fitzalan, Brian | 30th great-grandfather | XXXII | 32 |
| Fitzalan, Brian Fitzrandolph | 26th great-granduncle | XXX | 29 |
| 3rd cousin 30 times removed | XXXVIII | 34 |
| Fitzalan, Brian Haget | 28th great-grandfather | XXX | 30 |
| Fitzalan, Edmund | 21st great-grandfather | XXIII | 23 |
| 24th great-grandfather | XXVI | 26 |
| 6th cousin 23 times removed | XXXVII | 30 |
| 6th cousin 24 times removed | XXXVIII | 31 |
| 6th cousin 25 times removed | XXXIX | 32 |
| Fitzalan, Eleanor | 21st great-grandaunt | XXV | 24 |
| 24th great-grandaunt | XXVIII | 27 |
| 6th cousin 23 times removed | XXXVII | 30 |
| 6th cousin 24 times removed | XXXVIII | 31 |
| 6th cousin 25 times removed | XXXIX | 32 |
| Fitzalan, Joan Plantagenet | 19th great-grandaunt | XXIII | 22 |
| 22nd great-grandaunt | XXVI | 25 |
| 3rd cousin 21 times removed | XXIX | 25 |
| 4th cousin 22 times removed | XXXII | 27 |