| Name | Relationship with Natalie Seiwell | Civil | Canon |
| 3rd cousin 27 times removed | XXXV | 31 |
| 3rd cousin 29 times removed | XXXVII | 33 |
| 3rd cousin 30 times removed | XXXVIII | 34 |
| Clare, Richard | 29th great-grandfather | XXXI | 31 |
| Half 1st cousin 29 times removed | XXXIII | 31 |
| 2nd cousin 28 times removed | XXXIV | 31 |
| 2nd cousin 30 times removed | XXXVI | 33 |
| 2nd cousin 31 times removed | XXXVII | 34 |
| Clare, Richard Fitz Baldwin | 29th great-grandfather | XXXI | 31 |
| 1st cousin 32 times removed | XXXVI | 34 |
| Clare, Richard Fitzgilbert | 32nd great-grandfather | XXXIV | 34 |
| 33rd great-grandfather | XXXV | 35 |
| Clare, Richard Fitzgilbert Clermont | 31st great-grandfather | XXXIII | 33 |
| 30th great-granduncle | XXXIV | 33 |
| Husband of the 29th great-grandmother | | |
| Husband of the 28th great-grandaunt | | |
| Husband of the 31st great-grandaunt | | |
| Clare, Richard Fitzrichard Gifford | 31st great-granduncle | XXXV | 34 |
| 32nd great-granduncle | XXXVI | 35 |
| Clare, Robert Fitzrichard Gifford | 31st great-granduncle | XXXV | 34 |
| 32nd great-granduncle | XXXVI | 35 |
| Clare, Roger III | 28th great-grandfather | XXX | 30 |
| Clare, Roger Meschin | 30th great-grandfather | XXXII | 32 |
| Half 28th great-granduncle | XXXII | 31 |
| 1st cousin 29 times removed | XXXIII | 31 |
| 1st cousin 31 times removed | XXXV | 33 |
| 1st cousin 32 times removed | XXXVI | 34 |
| Clare, Roheasia Fitzgilbert Clermont | 30th great-grandaunt | XXXIV | 33 |
| 31st great-grandaunt | XXXV | 34 |
| Clare, Rohese Fitz Baldwin | 29th great-grandaunt | XXXIII | 32 |
| 1st cousin 32 times removed | XXXVI | 34 |
| Clare, Rohese Fitzrichard Gifford | 31st great-grandaunt | XXXV | 34 |
| 32nd great-grandaunt | XXXVI | 35 |
| Clare, Rohese Meschin | Half 28th great-grandaunt | XXXII | 31 |
| 1st cousin 29 times removed | XXXIII | 31 |
| 30th great-grandaunt | XXXIV | 33 |
| 1st cousin 31 times removed | XXXV | 33 |
| 1st cousin 32 times removed | XXXVI | 34 |
| Clare, Ronais Fitzrichard Gifford | 31st great-grandaunt | XXXV | 34 |
| 32nd great-grandaunt | XXXVI | 35 |
| Clare, William Fitzrichard Gifford | 31st great-granduncle | XXXV | 34 |
| 32nd great-granduncle | XXXVI | 35 |
| Claremont, Boudouin | 35th great-grandfather | XXXVII | 37 |
| 36th great-grandfather | XXXVIII | 38 |
| Clark, Magdalen | 13th great-grandmother | XV | 15 |
| 14th great-grandmother | XVI | 16 |
| Claton, Deborah | Wife of the 1st cousin 5 times removed | | |
| Clavering, Aubrey Fitzrichard | 26th great-grandmother | XXVIII | 28 |
| 29th great-grandmother | XXXI | 31 |
| Clavering, Eustace Fitzjohn | 28th great-grandfather | XXX | 30 |