| Name | Relationship with Natalie Seiwell | Civil | Canon |
| Wife of the 13th cousin 18 times removed | | |
| Wife of the 14th cousin 17 times removed | | |
| Wife of the 14th cousin 19 times removed | | |
| Wife of the 15th cousin 17 times removed | | |
| Wife of the 13th cousin 21 times removed | | |
| Tudor, Mary Plantagenet | 17th great-grandaunt | XXI | 20 |
| Turnham, Beatrice | 29th great-grandmother | XXXI | 31 |
| Twitchell, Agnes | 16th great-grandmother | XVIII | 18 |
| Twitchell, George B. | 17th great-grandfather | XIX | 19 |
| Twitchell, Henry | 18th great-grandfather | XX | 20 |
| Udny, Margaret Gordon | 12th great-grandmother | XIV | 14 |
| 4th cousin 13 times removed | XXIII | 18 |
| 4th cousin 17 times removed | XXVII | 22 |
| 8th cousin 11 times removed | XXIX | 20 |
| 7th cousin 13 times removed | XXIX | 21 |
| 6th cousin 16 times removed | XXX | 23 |
| 8th cousin 12 times removed | XXX | 21 |
| Half 8th cousin 12 times removed | XXX | 21 |
| 7th cousin 14 times removed | XXX | 22 |
| Half 6th cousin 16 times removed | XXX | 23 |
| 7th cousin 15 times removed | XXXI | 23 |
| 8th cousin 13 times removed | XXXI | 22 |
| 9th cousin 11 times removed | XXXI | 21 |
| 6th cousin 17 times removed | XXXI | 24 |
| Half 8th cousin 13 times removed | XXXI | 22 |
| Half 7th cousin 15 times removed | XXXI | 23 |
| Half 9th cousin 11 times removed | XXXI | 21 |
| 8th cousin 14 times removed | XXXII | 23 |
| 10th cousin 10 times removed | XXXII | 21 |
| 9th cousin 12 times removed | XXXII | 22 |
| 7th cousin 16 times removed | XXXII | 24 |
| Half 8th cousin 14 times removed | XXXII | 23 |
| Half 7th cousin 16 times removed | XXXII | 24 |
| Half 9th cousin 12 times removed | XXXII | 22 |
| 9th cousin 13 times removed | XXXIII | 23 |
| 8th cousin 15 times removed | XXXIII | 24 |
| Half 9th cousin 13 times removed | XXXIII | 23 |
| 10th cousin 11 times removed | XXXIII | 22 |
| Half 8th cousin 15 times removed | XXXIII | 24 |
| 7th cousin 17 times removed | XXXIII | 25 |
| Half 7th cousin 17 times removed | XXXIII | 25 |
| Half 10th cousin 11 times removed | XXXIII | 22 |
| Half 9th cousin 14 times removed | XXXIV | 24 |
| 9th cousin 14 times removed | XXXIV | 24 |
| Half 10th cousin 12 times removed | XXXIV | 23 |
| 11th cousin 10 times removed | XXXIV | 22 |
| Half 8th cousin 16 times removed | XXXIV | 25 |
| 7th cousin 18 times removed | XXXIV | 26 |
| 10th cousin 12 times removed | XXXIV | 23 |
| 10th cousin 13 times removed | XXXV | 24 |