| Notes |
- Karl Friedrich Hermann Demke (born on June 30, 1855 in Wollstein) and Auguste Maria Mathilde Rosentreter (born on January 7, 1855 in Graefrath) married on April 11, 1882 in Posen. Auguste's parents were August and Mathilde Rosentreter, née Kallet.
- https://szukajwarchiwach.pl/53/1926/0/3/107/str/1/9/15/6uJyztrLwECFX0gw0dE37g/#tabSkany
https://szukajwarchiwach.pl/53/1926/0/3/107/str/1/9/15/XQ_T6MfRBHwRT6wMdd8WTg/#tabSkany
- Karoline Mathilde Praxeda Demke was born on January 29, 1883 in Poznan
- Ferdinand August Willy Demke was born on May 20, 1884 in Posen. Parents: the Chief Fireman Hermann Demke and Auguste Rosentreter, both Protestant, living in Poznan
- Ferdinand Otto Hermann Demke was born on January 22, 1886 in Posen. Parents: the chief fireman Hermann Demke and Auguste R, both Protestant, living in Poznan
|