| Biethan, Christian | Poggenpohl | 1887 | Bremen |
| Biethan, Ernst Otto Carl | Neumann | 1891 | Walle |
| Biethan, Heinr. Chrstn. Ferd. | Poggenpohl | 1883 | Bremen |
| Biethan, Johanne Wilhelmine | Poggenpohl | 1888 | Bremen |
| Biethan, Louise | Poggenpohl | 1891 | Bremen |
| Biethan, Louise Clara Emilie | Poggenpohl | 1886 | Bremen |
| Biethan, Margarethe | Neumann | 1892 | Hemelingen |