| Name | Relationship with Natalie Seiwell | Civil | Canon |
| 36th great-grandfather | XXXVIII | 38 |
| Cornouaille, Budig | 32nd great-grandfather | XXXIV | 34 |
| 34th great-grandfather | XXXVI | 36 |
| 35th great-grandfather | XXXVII | 37 |
| 37th great-grandfather | XXXIX | 39 |
| Cornouaille, Budig Or Berhuc | 33rd great-grandfather | XXXV | 35 |
| 35th great-grandfather | XXXVII | 37 |
| 36th great-grandfather | XXXVIII | 38 |
| 38th great-grandfather | XL | 40 |
| Cornouaille, Hoel | 29th great-grandfather | XXXI | 31 |
| 31st great-grandfather | XXXIII | 33 |
| 32nd great-grandfather | XXXIV | 34 |
| 34th great-grandfather | XXXVI | 36 |
| Cornouaille, Orwen | 30th great-grandmother | XXXII | 32 |
| 33rd great-grandmother | XXXV | 35 |
| Coultie, Marion | 15th great-grandmother | XVII | 17 |
| Courtenay, Alix | 25th great-grandmother | XXVII | 27 |
| 28th great-grandmother | XXX | 30 |
| Cowell, Unknown | 14th great-grandmother | XVI | 16 |
| 15th great-grandmother | XVII | 17 |
| Craft, Archelous Hammons | 7th great-grandfather | IX | 9 |
| Husband of the 1st cousin 8 times removed | | |
| Husband of the half 1st cousin 8 times removed | | |
| Husband of the 3rd cousin 5 times removed | | |
| Husband of the 2nd cousin 7 times removed | | |
| Husband of the 2nd cousin 8 times removed | | |
| Husband of the 4th cousin 4 times removed | | |
| Husband of the 4th cousin 5 times removed | | |
| Husband of the 2nd cousin 11 times removed | | |
| Husband of the 5th cousin 5 times removed | | |
| Husband of the 2nd cousin 12 times removed | | |
| Husband of the 5th cousin 6 times removed | | |
| Craft, Henry | 9th great-grandfather | XI | 11 |
| Craft, James | 8th great-grandfather | X | 10 |
| Craft, Nancy Adams | 6th great-grandmother | VIII | 8 |
| 2nd cousin 7 times removed | XIII | 10 |
| Half 2nd cousin 7 times removed | XIII | 10 |
| 4th cousin 4 times removed | XIV | 9 |
| 3rd cousin 6 times removed | XIV | 10 |
| 3rd cousin 7 times removed | XV | 11 |
| 5th cousin 3 times removed | XV | 9 |
| 5th cousin 4 times removed | XVI | 10 |
| 3rd cousin 10 times removed | XVIII | 14 |
| 6th cousin 4 times removed | XVIII | 11 |
| 3rd cousin 11 times removed | XIX | 15 |
| 6th cousin 5 times removed | XIX | 12 |
| Wife of the 1st cousin 7 times removed | | |
| Wife of the 1st cousin 8 times removed | | |
| Wife of the 9th great-granduncle | | |
| Wife of the 10th great-granduncle | | |