| Name | Relationship with Natalie Seiwell | Civil | Canon |
| 30th great-grandfather | XXXII | 32 |
| 28th great-granduncle | XXXII | 31 |
| 29th great-granduncle | XXXIII | 32 |
| Fitzbrian, Alan Hansard | 27th great-grandfather | XXIX | 29 |
| Husband of the 2nd cousin 31 times removed | | |
| Fitzhenry, Gladys | 31st great-grandmother | XXXIII | 33 |
| 29th great-grandaunt | XXXIII | 32 |
| Fitzhenry, Henry | 30th great-grandfather | XXXII | 32 |
| 32nd great-grandfather | XXXIV | 34 |
| Fitzhenry, Henry | 29th great-grandfather | XXXI | 31 |
| 31st great-granduncle | XXXV | 34 |
| Fitzhenry, Randolph Fitzwalter | 28th great-grandfather | XXX | 30 |
| 1st cousin 32 times removed | XXXVI | 34 |
| Fitznigel, John | 29th great-grandfather | XXXI | 31 |
| 32nd great-grandfather | XXXIV | 34 |
| Fitznigel, Matilda Agnes | 28th great-grandmother | XXX | 30 |
| 31st great-grandmother | XXXIII | 33 |
| Fitznigel, William | 29th great-grandfather | XXXI | 31 |
| 32nd great-grandfather | XXXIV | 34 |
| Fitzrandolph, Agnes | 27th great-grandmother | XXIX | 29 |
| 2nd cousin 31 times removed | XXXVII | 34 |
| Fitzrobert, Walter | 30th great-grandfather | XXXII | 32 |
| Fitzrobert, William Fitzhamon | 30th great-grandfather | XXXII | 32 |
| Fitzsiward, Sibyl | 28th great-grandaunt | XXXII | 31 |
| Fitzwalter, Alan | 24th great-grandfather | XXVI | 26 |
| 25th great-grandfather | XXVII | 27 |
| 26th great-grandfather | XXVIII | 28 |
| 27th great-grandfather | XXIX | 29 |
| 28th great-grandfather | XXX | 30 |
| 29th great-grandfather | XXXI | 31 |
| 30th great-grandfather | XXXII | 32 |
| Fitzwalter, Alice | 29th great-grandmother | XXXI | 31 |
| Wife of the 31st great-granduncle | | |
| Fitzwalter, Bertha Newmarche | 30th great-grandmother | XXXII | 32 |
| Fitzwalter, Christine Valognes | 29th great-grandmother | XXXI | 31 |
| Fitzwalter, Lucy Newmarche | 30th great-grandaunt | XXXIV | 33 |
| Fitzwalter, Margaret Newmarche | 30th great-grandaunt | XXXIV | 33 |
| Fitzwalter, Maud | 29th great-grandaunt | XXXIII | 32 |
| Fitzwalter, Miles | 31st great-grandfather | XXXIII | 33 |
| Fitzwalter, Robert | 29th great-granduncle | XXXIII | 32 |
| Fitzwalter, Simon | 26th great-grandfather | XXVIII | 28 |
| Fitzwalter, Walter | 25th great-grandfather | XXVII | 27 |
| 26th great-grandfather | XXVIII | 28 |
| 27th great-grandfather | XXIX | 29 |
| 28th great-grandfather | XXX | 30 |
| 29th great-grandfather | XXXI | 31 |
| 30th great-grandfather | XXXII | 32 |
| 31st great-grandfather | XXXIII | 33 |
| Fitzwalter, William Newmarche | 30th great-granduncle | XXXIV | 33 |
| Fitzwilliam, Amice Beaumont | 29th great-grandmother | XXXI | 31 |