| Name | Relationship with Natalie Seiwell | Civil | Canon |
| Swillington, Anne | 22nd great-grandmother | XXIV | 24 |
| Swillington, Roger | 23rd great-grandfather | XXV | 25 |
| Swinton, Elizabeth | 16th great-grandmother | XVIII | 18 |
| Swinton, Helen | 15th great-grandmother | XVII | 17 |
| Sybilla | 8th great-grandmother | X | 10 |
| Synton, Alexander | 21st great-grandfather | XXIII | 23 |
| 22nd great-grandfather | XXIV | 24 |
| Taillefer, Alduin | 34th great-grandfather | XXXVI | 36 |
| 37th great-grandfather | XXXIX | 39 |
| Taillefer, Arnold | 32nd great-grandfather | XXXIV | 34 |
| 35th great-grandfather | XXXVII | 37 |
| Taillefer, Aymer | 25th great-grandfather | XXVII | 27 |
| 28th great-grandfather | XXX | 30 |
| Taillefer, Foulques D'Archaic | 29th great-grandfather | XXXI | 31 |
| 32nd great-grandfather | XXXIV | 34 |
| Taillefer, Geoffrey D'Archaic | 29th great-granduncle | XXXIII | 32 |
| 32nd great-granduncle | XXXVI | 35 |
| Taillefer, Geoffrey I | 30th great-grandfather | XXXII | 32 |
| 33rd great-grandfather | XXXV | 35 |
| Taillefer, Humberge D'Archaic | 29th great-grandaunt | XXXIII | 32 |
| 32nd great-grandaunt | XXXVI | 35 |
| Taillefer, Isabelle | 24th great-grandmother | XXVI | 26 |
| 27th great-grandmother | XXIX | 29 |
| Taillefer, Vulgrin | 25th great-granduncle | XXIX | 28 |
| 28th great-granduncle | XXXII | 31 |
| Taillefer, William | 33rd great-grandfather | XXXV | 35 |
| 36th great-grandfather | XXXVIII | 38 |
| Taillefer, William II | 31st great-grandfather | XXXIII | 33 |
| 34th great-grandfather | XXXVI | 36 |
| Taillefer, William III D'Eu | 28th great-grandfather | XXX | 30 |
| 31st great-grandfather | XXXIII | 33 |
| Taillefer, William IV | 26th great-grandfather | XXVIII | 28 |
| 29th great-grandfather | XXXI | 31 |
| Taillefer, Wulgrin II | 27th great-grandfather | XXIX | 29 |
| 30th great-grandfather | XXXII | 32 |
| Talbot, Hugh | 30th great-granduncle | XXXIV | 33 |
| 33rd great-granduncle | XXXVII | 36 |
| Tatton, Isabel | 22nd great-grandmother | XXIV | 24 |
| Tatton, Robert | 23rd great-grandfather | XXV | 25 |
| Taurode, Joseline | 30th great-grandmother | XXXII | 32 |
| 31st great-grandmother | XXXIII | 33 |
| 32nd great-grandmother | XXXIV | 34 |
| Tey, Margaret Marks | 24th great-grandmother | XXVI | 26 |
| Tey, William Duckett | 25th great-grandfather | XXVII | 27 |
| Thoenen, Dorothea | 11th great-grandmother | XIII | 13 |
| Thomas, Anne | 12th great-grandmother | XIV | 14 |
| Wife of the half 18th cousin 12 times removed | | |
| Wife of the 19th cousin 11 times removed | | |
| Wife of the 17th cousin 16 times removed | | |
| Wife of the 19th cousin 12 times removed | | |