| Name | Relationship with Natalie Seiwell | Civil | Canon |
| 2nd cousin 29 times removed | XXXV | 32 |
| Sinclair, William | 29th great-grandfather | XXXI | 31 |
| Sinclair, William Dreux | 22nd great-grandfather | XXIV | 24 |
| 24th great-grandfather | XXVI | 26 |
| Husband of the 21st great-grandaunt | | |
| Husband of the 23rd great-grandaunt | | |
| Husband of the 24th great-grandaunt | | |
| Husband of the 2nd cousin 22 times removed | | |
| Husband of the 25th great-grandaunt | | |
| Husband of the 2nd cousin 26 times removed | | |
| Husband of the 2nd cousin 27 times removed | | |
| Husband of the 2nd cousin 28 times removed | | |
| Husband of the 5th cousin 22 times removed | | |
| Husband of the 5th cousin 23 times removed | | |
| Husband of the 5th cousin 24 times removed | | |
| Husband of the 5th cousin 25 times removed | | |
| Husband of the 5th cousin 26 times removed | | |
| Husband of the 5th cousin 27 times removed | | |
| Husband of the 5th cousin 28 times removed | | |
| Sinclair, William Fenton | 22nd great-grandfather | XXIV | 24 |
| 1st cousin 22 times removed | XXVI | 24 |
| 2nd cousin 21 times removed | XXVII | 24 |
| 2nd cousin 23 times removed | XXIX | 26 |
| 2nd cousin 24 times removed | XXX | 27 |
| 4th cousin 20 times removed | XXX | 25 |
| 2nd cousin 25 times removed | XXXI | 28 |
| 4th cousin 24 times removed | XXXIV | 29 |
| 4th cousin 25 times removed | XXXV | 30 |
| 4th cousin 26 times removed | XXXVI | 31 |
| 7th cousin 20 times removed | XXXVI | 28 |
| 7th cousin 21 times removed | XXXVII | 29 |
| 7th cousin 22 times removed | XXXVIII | 30 |
| 7th cousin 23 times removed | XXXIX | 31 |
| 7th cousin 24 times removed | XL | 32 |
| 7th cousin 25 times removed | XLI | 33 |
| 7th cousin 26 times removed | XLII | 34 |
| Sinclair, William Grathenay | 26th great-grandfather | XXVIII | 28 |
| 2nd cousin 29 times removed | XXXV | 32 |
| Husband of the 23rd great-grandaunt | | |
| Husband of the 24th great-grandaunt | | |
| Husband of the 25th great-grandaunt | | |
| Husband of the 26th great-grandaunt | | |
| Husband of the 27th great-grandaunt | | |
| Husband of the 3rd cousin 24 times removed | | |
| Husband of the 3rd cousin 25 times removed | | |
| Husband of the 3rd cousin 26 times removed | | |
| Husband of the 3rd cousin 27 times removed | | |
| Husband of the 3rd cousin 28 times removed | | |
| Husband of the 3rd cousin 29 times removed | | |
| Husband of the 3rd cousin 30 times removed | | |