| Name | Relationship with Natalie Seiwell | Civil | Canon |
| 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 |
| Fitzalan, John | 25th great-grandfather | XXVII | 27 |
| 28th great-grandfather | XXX | 30 |
| 2nd cousin 27 times removed | XXXIII | 30 |
| 2nd cousin 28 times removed | XXXIV | 31 |
| 2nd cousin 29 times removed | XXXV | 32 |
| Fitzalan, John | 23rd great-grandfather | XXV | 25 |
| 26th great-grandfather | XXVIII | 28 |
| 4th cousin 25 times removed | XXXV | 30 |
| 4th cousin 26 times removed | XXXVI | 31 |
| 4th cousin 27 times removed | XXXVII | 32 |
| Fitzalan, John D'Aubigny | 24th great-grandfather | XXVI | 26 |
| 27th great-grandfather | XXIX | 29 |
| 3rd cousin 26 times removed | XXXIV | 30 |
| 3rd cousin 27 times removed | XXXV | 31 |
| 3rd cousin 28 times removed | XXXVI | 32 |
| Fitzalan, Richard | 22nd great-grandfather | XXIV | 24 |
| 25th great-grandfather | XXVII | 27 |
| 5th cousin 24 times removed | XXXVI | 30 |
| 5th cousin 25 times removed | XXXVII | 31 |
| 5th cousin 26 times removed | XXXVIII | 32 |
| Fitzalan, Richard | 20th great-grandfather | XXII | 22 |
| 23rd great-grandfather | XXV | 25 |
| 7th cousin 22 times removed | XXXVIII | 30 |
| 7th cousin 23 times removed | XXXIX | 31 |
| 7th cousin 24 times removed | XL | 32 |
| Husband of the 2nd cousin 22 times removed | | |
| Husband of the 3rd cousin 23 times removed | | |
| Husband of the 2nd cousin 25 times removed | | |
| Husband of the 3rd cousin 26 times removed | | |
| Fitzalan, Richard Plantagenet | 19th great-granduncle | XXIII | 22 |
| 22nd great-granduncle | XXVI | 25 |
| 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 |
| Fitzalan, William | 26th great-grandfather | XXVIII | 28 |
| 29th great-grandfather | XXXI | 31 |
| 1st cousin 28 times removed | XXXII | 30 |
| 1st cousin 29 times removed | XXXIII | 31 |
| 1st cousin 30 times removed | XXXIV | 32 |
| Fitzalan, William | 27th great-grandfather | XXIX | 29 |
| 27th great-granduncle | XXXI | 30 |