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| Name | Johann Ferdinand Demke | |
| Born | 24 Apr 1849 | Neuhausen, Konigsberg, East Prussia, Germany |
| Christened | 15 May 1849 | Neuhausen, Konigsberg, East Prussia, Germany |
| Gender | Male | |
| Person ID | I130 | Stevens-English |
| Last Modified | 12 Mar 2015 | |
| Father | Johann Gottlieb Demke, b. 7 May 1821, Thiemsdorf, Königsberg, East Prussia, Germany | |
| Mother | Wilhelmine Henriette Magadelina Kuhr, b. 22 Oct 1828, Neuhausen, Konigsberg, East Prussia, Germany | |
| Married | 9 Apr 1849 | Neuhausen, Konigsberg, East Prussia, Germany |
| Family ID | F20 | Group Sheet | Family Chart |
| Family | Heinriette Wiemer, b. Abt 1853, Wiswainen, Kraupischken, Niederung, Ostpreussen, Germany | |
| Married | <1874> | East Prussia, Prussia, Germany |
| Last Modified | 17 Mar 2015 | |
| Family ID | F68 | Group Sheet | Family Chart |