

| Peter Wilhelm Firmenich | |
| *: | 30 Nov 1878 |
| Langerwehe, (DE) | |
| Wilhelm Peter Firmenich | |
| *: | 1879 |
| +: | 19 Jan 1902 |
| Langerwehe, (DE) | |
| Anna Catharina Hündgen | |
| *: | 26 Okt 1851 |
| Langerwehe, (DE) | |
| Peter Firmenich | |
| *: | 28 Mai 1849 |
| Lessenich, Euskirchen, (DE) | |
| +: | 22 Aug 1929 |
| Hauptstrasse 32, Langerwehe, (DE) | |