| Kostka, Annastasia Agathe | 1905 | Blumenthal | |
| Kostka, Else Hedwig | Skowski | 1906 | Bremen 1 |
| Kostka, Herta Martha Agnes | Skowski | 1908 | Bremen 1 |
| Kostka, Karl Walter Emil | Skowski | 1910 | Bremen 1 |
| Kostka, Marie Auguste Wilhelmine | Skowski | 1903 | Bremen 1 |
| Kostka, Therese Viktoria | 1903 | Blumenthal |