| Siebens, Albertus Peter | Fischer | 1888 | Bremen |
| Siebens, Berta Helene Ulfert | Sander | 1910 | Bremen 1 |
| Siebens, Diedr. Alfred Paul | Fischer | 1884 | Bremen |
| Siebens, Irmgard | Siebens | 1910 | Bremen 1 |
| Siebens, Karoline Menna | Fischer | 1893 | Bremen |
| Siebens, Paula Alberta Gerhardine | Fischer | 1890 | Bremen |