| Retberg, Christian Georg Heinrich | Beneke | 1878 | Bremen |
| Retberg, Ella | Metze | 1908 | Bremen 1 |
| Retberg, Georg Heinrich | Metze | 1912 | Bremen 1 |
| Retberg, Heinrich | Beneke | 1885 | Bremen |
| Retberg, Johann Hermann Diedrich | Behnken | 1879 | Bremen |
| Retberg, Louis Theodor | Beneke | 1887 | Bremen |
| Retberg, Lucie Marie | Ehlers | 1910 | Bremen 1 |
| Retberg, Meta | Metze | 1909 | Bremen 1 |