| Peter Johannes Kees Louwman |
| Peter Johannes Kees Louwman | |
| G: | 29 nov 1935 |
| Wassenaar | |
| O: | 21 jul 2023 |
| Wassenaar | |
| Pieter Wijnand Louwman |
| Pieter Wijnand Louwman | |
| G: | 1 apr 1902 |
| Rotterdam | |
| O: | 6 mei 1969 |
| Wassenaar | |
| Valentine Elvira Diedrich |
| Valentine Elvira Diedrich | |
| G: | 14 jul 1909 |
| New York (NY, USA) | |
| H: | 28 aug 1930 |
| Frankfurt am Main (D) | |
| O: | 21 okt 1963 |
| Den Haag | |
|
| Louisa Petronella de Breij |
| Louisa Petronella de Breij | |
| G: | ca. 1867 |
| Rotterdam | |
| O: | Ja, datum echter onbekend |
| Cornelis Klaas Louwman |
| Cornelis Klaas Louwman | |
| G: | ca. 1866 |
| Rotterdam | |
| H: | 8 jul 1897 |
| Rotterdam | |
| O: | 12 dec 1955 |
| Den Haag | |