| Keffel, August Adolf Heinr. | Barning | 1889 | Bremen |
| Keffel, August Ernst | Barning | 1891 | Bremen |
| Keffel, Auguste Dorothee Marie | Barning | 1883 | Bremen |
| Keffel, Christian August | Weddingfeld | 1911 | Bremen 1 |
| Keffel, Friedrich Karl | Weddingfeld | 1910 | Bremen 1 |
| Keffel, Heinrich Wilhelm | Barning | 1899 | Bremen |
| Keffel, Johannes Wilhelm | Barning | 1884 | Bremen |
| Keffel, Johannes Wilhelm | Weddingfeld | 1909 | Bremen 1 |
| Keffel, Margarethe Marie Metta | Barning | 1886 | Bremen |