| Siebel, Adolf Ludwig | 1938 | Freie Hansestadt Bremen | |
| Siebel, Albert | 1934 | Bremen 1 | |
| Siebel, Aloisia Philomena | Müller | 1919 | Bremen 1 |
| Siebel, Auguste Wilhelmine | Faber | 1924 | Bremen 1 |
| Siebel, Diedrich | 1921 | Bremen 2 (Hastedt) | |
| Siebel, Dorothea | 1930 | Bremen 1 | |
| Siebel, Ernestine | 1914 | Bremen 1 | |
| Siebel, Ernst | 1915 | Bremen 1 | |
| Siebel, Ernst | 1920 | Bremen 1 |