| Name | Relationship with Natalie Seiwell | Civil | Canon |
| 3rd cousin 25 times removed | XXXIII | 29 |
| 3rd cousin 26 times removed | XXXIV | 30 |
| 6th cousin 21 times removed | XXXV | 28 |
| 6th cousin 22 times removed | XXXVI | 29 |
| 6th cousin 23 times removed | XXXVII | 30 |
| 6th cousin 24 times removed | XXXVIII | 31 |
| 5th cousin 26 times removed | XXXVIII | 32 |
| 6th cousin 25 times removed | XXXIX | 32 |
| 6th cousin 26 times removed | XL | 33 |
| 6th cousin 27 times removed | XLI | 34 |
| Sinclair, John | 24th great-grandfather | XXVI | 26 |
| 2nd cousin 23 times removed | XXIX | 26 |
| 2nd cousin 24 times removed | XXX | 27 |
| 2nd cousin 25 times removed | XXXI | 28 |
| 2nd cousin 26 times removed | XXXII | 29 |
| 2nd cousin 27 times removed | XXXIII | 30 |
| 5th cousin 22 times removed | XXXIV | 28 |
| 5th cousin 23 times removed | XXXV | 29 |
| 5th cousin 24 times removed | XXXVI | 30 |
| 5th cousin 25 times removed | XXXVII | 31 |
| 4th cousin 27 times removed | XXXVII | 32 |
| 5th cousin 26 times removed | XXXVIII | 32 |
| 5th cousin 27 times removed | XXXIX | 33 |
| 5th cousin 28 times removed | XL | 34 |
| Sinclair, Katherine | 19th great-grandmother | XXI | 21 |
| Wife of the 4th cousin 22 times removed | | |
| Wife of the 7th cousin 16 times removed | | |
| Wife of the 8th cousin 17 times removed | | |
| Wife of the 8th cousin 18 times removed | | |
| Wife of the 8th cousin 19 times removed | | |
| Wife of the 8th cousin 20 times removed | | |
| Wife of the 8th cousin 21 times removed | | |
| Sinclair, Margaret | 20th great-grandaunt | XXIV | 23 |
| 3rd cousin 20 times removed | XXVIII | 24 |
| 4th cousin 19 times removed | XXIX | 24 |
| 4th cousin 21 times removed | XXXI | 26 |
| 4th cousin 22 times removed | XXXII | 27 |
| 6th cousin 18 times removed | XXXII | 25 |
| 4th cousin 23 times removed | XXXIII | 28 |
| 6th cousin 22 times removed | XXXVI | 29 |
| 6th cousin 23 times removed | XXXVII | 30 |
| 6th cousin 24 times removed | XXXVIII | 31 |
| 9th cousin 18 times removed | XXXVIII | 28 |
| 9th cousin 19 times removed | XXXIX | 29 |
| 9th cousin 20 times removed | XL | 30 |
| 9th cousin 21 times removed | XLI | 31 |
| 9th cousin 22 times removed | XLII | 32 |
| 9th cousin 23 times removed | XLIII | 33 |
| 9th cousin 24 times removed | XLIV | 34 |
| Sinclair, Richilde Grathenay | 26th great-grandaunt | XXX | 29 |