| Name | Relationship with Natalie Seiwell | Civil | Canon |
| Pennypacker, Johann Heinrich | 7th great-grandfather | IX | 9 |
| Peryente, Elizabeth | 17th great-grandmother | XIX | 19 |
| Wife of the half 13th cousin 17 times removed | | |
| Wife of the 14th cousin 16 times removed | | |
| Wife of the 12th cousin 21 times removed | | |
| Wife of the 14th cousin 17 times removed | | |
| Wife of the 14th cousin 18 times removed | | |
| Wife of the 14th cousin 19 times removed | | |
| Peters, Isaac | Husband of the 1st cousin 7 times removed | | |
| Peyto, Audrey | 15th great-grandmother | XVII | 17 |
| Peyton, John | 29th great-grandfather | XXXI | 31 |
| Peyton, John | 27th great-grandfather | XXIX | 29 |
| Peyton, Nigel | 28th great-grandfather | XXX | 30 |
| Peyton, Reginald | 30th great-grandfather | XXXII | 32 |
| Pfannebecker, Jan | 10th great-grandfather | XII | 12 |
| Pfannebecker, Johann Frederick | 1st cousin 8 times removed | XII | 10 |
| Pfannebecker, Johann Georg | 7th great-granduncle | XI | 10 |
| Pfannebecker, Lotharios | 9th great-grandfather | XI | 11 |
| Pfannebeker, Johannes | 8th great-grandfather | X | 10 |
| Philippa | 20th great-grandmother | XXII | 22 |
| 23rd great-grandmother | XXV | 25 |
| Wife of the half 1st cousin 22 times removed | | |
| Wife of the half 2nd cousin 22 times removed | | |
| Wife of the 2nd cousin 22 times removed | | |
| Wife of the half 1st cousin 25 times removed | | |
| Wife of the half 2nd cousin 25 times removed | | |
| Wife of the 4th cousin 21 times removed | | |
| Wife of the 2nd cousin 25 times removed | | |
| Wife of the 3rd cousin 23 times removed | | |
| Wife of the 4th cousin 24 times removed | | |
| Wife of the 3rd cousin 26 times removed | | |
| Phillips, Oma Belle | Wife of the 6th cousin twice removed | | |
| Pieters, Bernhardina Vanderslice | 2nd cousin 6 times removed | XII | 9 |
| Pilkington, Alexander | 30th great-grandfather | XXXII | 32 |
| Pilkington, Alexander | 29th great-grandfather | XXXI | 31 |
| Pilkington, Alexander | 27th great-grandfather | XXIX | 29 |
| Pilkington, Edmund | 22nd great-granduncle | XXVI | 25 |
| Pilkington, Elizabeth | 22nd great-grandaunt | XXVI | 25 |
| Pilkington, Isabella | 23rd great-grandaunt | XXVII | 26 |
| Pilkington, Isabella Bury | 24th great-grandaunt | XXVIII | 27 |
| Pilkington, John | 23rd great-grandfather | XXV | 25 |
| Pilkington, Laura | 23rd great-grandaunt | XXVII | 26 |
| Pilkington, Margaret | 22nd great-grandmother | XXIV | 24 |
| Pilkington, Roger | 28th great-grandfather | XXX | 30 |
| Pilkington, Roger | 25th great-grandfather | XXVII | 27 |
| Pilkington, Roger Bury | 24th great-grandfather | XXVI | 26 |
| Pilkington, Roger Chetham | 26th great-grandfather | XXVIII | 28 |
| Pitcairn, Henry | 17th great-grandfather | XIX | 19 |
| Pitcairn, Isabella Ramsay | 16th great-grandmother | XVIII | 18 |
| Wife of the 2nd cousin 18 times removed | | |