| Name | Relationship with Natalie Seiwell | Civil | Canon |
| Montdidier, Hildouin Rameru | 35th great-grandfather | XXXVII | 37 |
| 36th great-grandfather | XXXVIII | 38 |
| Montfichet, Mary | 19th great-grandmother | XXI | 21 |
| 22nd great-grandmother | XXIV | 24 |
| Montfichet, William | 20th great-grandfather | XXII | 22 |
| 23rd great-grandfather | XXV | 25 |
| Montfort, Matilda | 31st great-grandmother | XXXIII | 33 |
| Montfort, Peter Of Beaudesert | 32nd great-grandfather | XXXIV | 34 |
| Montgomerie, Alan | 25th great-grandfather | XXVII | 27 |
| 26th great-grandfather | XXVIII | 28 |
| 27th great-grandfather | XXIX | 29 |
| 2nd cousin 27 times removed | XXXIII | 30 |
| 2nd cousin 30 times removed | XXXVI | 33 |
| Montgomerie, Alan | 23rd great-grandfather | XXV | 25 |
| 24th great-grandfather | XXVI | 26 |
| 25th great-grandfather | XXVII | 27 |
| 4th cousin 25 times removed | XXXV | 30 |
| 4th cousin 28 times removed | XXXVIII | 33 |
| Montgomerie, Alan Murray | 21st great-grandfather | XXIII | 23 |
| 22nd great-granduncle | XXVI | 25 |
| 23rd great-granduncle | XXVII | 26 |
| 6th cousin 23 times removed | XXXVII | 30 |
| 6th cousin 26 times removed | XL | 33 |
| Montgomerie, Alexander | 18th great-grandfather | XX | 20 |
| 2nd cousin 18 times removed | XXIV | 21 |
| 2nd cousin 19 times removed | XXV | 22 |
| 4th cousin 16 times removed | XXVI | 21 |
| Half 2nd cousin 20 times removed | XXVI | 23 |
| 2nd cousin 21 times removed | XXVII | 24 |
| Half 4th cousin 17 times removed | XXVII | 22 |
| Half 4th cousin 18 times removed | XXVIII | 23 |
| 5th cousin 16 times removed | XXVIII | 22 |
| Half 3rd cousin 20 times removed | XXVIII | 24 |
| Half 3rd cousin 21 times removed | XXIX | 25 |
| Half 4th cousin 19 times removed | XXIX | 24 |
| 5th cousin 18 times removed | XXX | 24 |
| Half 4th cousin 20 times removed | XXX | 25 |
| 5th cousin 19 times removed | XXXI | 25 |
| 6th cousin 17 times removed | XXXI | 24 |
| 6th cousin 18 times removed | XXXII | 25 |
| 5th cousin 20 times removed | XXXII | 26 |
| 7th cousin 17 times removed | XXXIII | 25 |
| 8th cousin 15 times removed | XXXIII | 24 |
| 5th cousin 21 times removed | XXXIII | 27 |
| 6th cousin 19 times removed | XXXIII | 26 |
| 6th cousin 20 times removed | XXXIV | 27 |
| 8th cousin 16 times removed | XXXIV | 25 |
| 7th cousin 18 times removed | XXXIV | 26 |
| 6th cousin 21 times removed | XXXV | 28 |
| 7th cousin 19 times removed | XXXV | 27 |