| Siech, David Karl Robert | 1916 | Bremen 3 (Woltm.hsn) | |
| Siech, Emma Caroline | Moldenhauer | 1914 | Bremen 1 |
| Siech, Herb. Georg Edgar | 1912 | Bremen 1 | |
| Siech, Hubert Paul Oskar | 1936 | Bremen 1 | |
| Siech, Rob. Paul Oskar | 1912 | Bremen 1 | |
| Siech, Sophie Marie Margarethe | Meyer | 1920 | Bremen 3 (Woltm.hsn) |