| Name | Birth date | Relationship with Robert Frei |
| Pelham, Lavinia | Bef. 1750 | 6th great-grandmother |
| Pelham, William | | 7th great-grandfather |
| Pelton, Benjamin | | 7th great-grandfather of the wife |
| Pelton, Keziah | | 6th great-grandmother of the wife |
| Pennington, Martin | Private | Husband of the 2nd cousin |
| Perfitt, Benjamin | Private | 2nd cousin once removed of the wife |
| Perfitt, Brian | Private | 2nd cousin once removed of the wife |
| Perfitt, Molly | Private | 2nd cousin once removed of the wife |
| Perfitt, Peter | Private | 2nd cousin once removed of the wife |
| Perot, Jacques | Bef. 29 Dec 1695 | 1st cousin 9 times removed |
| Perot, Jan | | Husband of the 8th great-grandaunt |
| Perot, Maria | Bef. 10 Aug 1690 | 1st cousin 9 times removed |
| Perot, Maria | Bef. 02 Feb 1696/97 | 1st cousin 9 times removed |
| Perot, Pierre | Bef. 24 Feb 1688/89 | 1st cousin 9 times removed |
| Perot, Pierre | Bef. 24 Aug 1692 | 1st cousin 9 times removed |
| Persson, Carl Johan | Abt. 1826 | 2nd great-grandfather of the wife |
| Pete | Private | Half 2nd cousin |
| Petit, Christophe | | 8th great-grandfather of the wife |
| Petit, Henri | Abt. 1622 | 7th great-grandfather of the wife |
| Petit, Henri | Bef. 1642 | 6th great-granduncle of the wife |
| Petit, Joseph | Bef. 1645 | 6th great-grandfather of the wife |
| Petrimoulx, Adelaide | 25 May 1824 | 2nd great-grandaunt of the wife |
| Petrimoulx, Charlotte Aurelia | 07 Feb 1819 | 2nd great-grandaunt of the wife |
| Petrimoulx, Edesse | 11 Jan 1815 | 2nd great-grandaunt of the wife |
| Petrimoulx, Euphrosine | 31 Mar 1813 | 2nd great-grandaunt of the wife |
| Petrimoulx, Francis | 1779 | 3rd great-grandfather of the wife |
| Petrimoulx, Francis | 09 Aug 1809 | 2nd great-granduncle of the wife |
| Petrimoulx, Francois | 09 Sep 1742 | 4th great-grandfather of the wife |
| Petrimoulx, Henry Neree | 03 May 1817 | 2nd great-granduncle of the wife |
| Petrimoulx, Magdelene Symphronia | 02 Feb 1827 | 2nd great-grandaunt of the wife |
| Petrimoulx, Matilda | 12 Nov 1821 | 2nd great-grandmother of the wife |
| Petrimoulx, Pierre | | 6th great-grandfather of the wife |
| Petrimoulx, Pierre Michel | Bef. 1690 | 5th great-grandfather of the wife |
| Petrimoulx, Rudolph | 21 Apr 1811 | 2nd great-granduncle of the wife |
| Pettit, Brett Joseph | Private | 4th cousin twice removed of the wife |
| Pettit, Jean | | 9th great-grandfather of the wife |
| Pettit, Lindsey Christine | Private | 4th cousin twice removed of the wife |
| Pettit, Marie Rose | Bef. 1651 | 8th great-grandmother of the wife |
| Peyton, Erica Leigh | Private | 4th cousin once removed of the wife |
| Peyton, Janis Mary | Private | 4th cousin of the wife |
| Peyton, Jenna Michelle | Private | 4th cousin once removed of the wife |
| Peyton, Michael Robert | Private | 4th cousin of the wife |
| Phillips, Andrew Wilburn | Private | 6th cousin twice removed of the wife |
| Phillips, Charles W. | Abt. 1863 | 1st cousin 3 times removed of the wife |
| Phillips, George | 11 Sep 1803 | 2nd cousin 5 times removed of the wife |
| Phillips, Hartzel Coryell | Private | 6th cousin twice removed of the wife |
| Phillips, Henry | Abt. 1852 | 1st cousin 3 times removed of the wife |
| Phillips, Jennie L. | 21 Sep 1865 | 1st cousin 3 times removed of the wife |
| Phillips, Joseph | Abt. 1849 | 1st cousin 3 times removed of the wife |
| Phillips, Levi | Abt. 1869 | 2nd cousin twice removed of the wife |