| Name | Relationship with John FitzAlan | Civil | Canon |
|---|
| 3rd cousin 12 times removed | XX | 16 |
| 3rd cousin 13 times removed | XXI | 17 |
| 4th cousin 11 times removed | XXI | 16 |
| Half 4th cousin 12 times removed | XXII | 17 |
| 4th cousin 12 times removed | XXII | 17 |
| 4th cousin 13 times removed | XXIII | 18 |
| Half 4th cousin 13 times removed | XXIII | 18 |
| Preston, Lloyd | 10th great-grandnephew | XIV | 13 |
| 1st cousin 12 times removed | XVI | 14 |
| Half 2nd cousin 13 times removed | XIX | 16 |
| 3rd cousin 12 times removed | XX | 16 |
| 3rd cousin 13 times removed | XXI | 17 |
| 4th cousin 11 times removed | XXI | 16 |
| Half 4th cousin 12 times removed | XXII | 17 |
| 4th cousin 12 times removed | XXII | 17 |
| 4th cousin 13 times removed | XXIII | 18 |
| Half 4th cousin 13 times removed | XXIII | 18 |
| Preston, Margaret | 10th great-grandniece | XIV | 13 |
| 1st cousin 12 times removed | XVI | 14 |
| Half 2nd cousin 13 times removed | XIX | 16 |
| 3rd cousin 12 times removed | XX | 16 |
| 3rd cousin 13 times removed | XXI | 17 |
| 4th cousin 11 times removed | XXI | 16 |
| Half 4th cousin 12 times removed | XXII | 17 |
| 4th cousin 12 times removed | XXII | 17 |
| 4th cousin 13 times removed | XXIII | 18 |
| Half 4th cousin 13 times removed | XXIII | 18 |
| Preston, Mary | 10th great-grandniece | XIV | 13 |
| 1st cousin 12 times removed | XVI | 14 |
| Half 2nd cousin 13 times removed | XIX | 16 |
| 3rd cousin 12 times removed | XX | 16 |
| 3rd cousin 13 times removed | XXI | 17 |
| 4th cousin 11 times removed | XXI | 16 |
| Half 4th cousin 12 times removed | XXII | 17 |
| 4th cousin 12 times removed | XXII | 17 |
| 4th cousin 13 times removed | XXIII | 18 |
| Half 4th cousin 13 times removed | XXIII | 18 |
| Preston, Samuel | Husband of the 9th great-grandniece | | |
| Husband of the 1st cousin 11 times removed | | |
| Husband of the half 2nd cousin 12 times removed | | |
| Husband of the 3rd cousin 11 times removed | | |
| Husband of the 3rd cousin 12 times removed | | |
| Husband of the 4th cousin 10 times removed | | |
| Husband of the half 4th cousin 11 times removed | | |
| Husband of the 4th cousin 11 times removed | | |
| Husband of the 4th cousin 12 times removed | | |
| Husband of the half 4th cousin 12 times removed | | |
| Preston, Samuel | Husband of the 9th great-grandniece | | |
| Husband of the 1st cousin 11 times removed | | |
| Husband of the half 2nd cousin 12 times removed | | |
