August married Henriette Pollnow. Henriette (daughter of Georg Friedrich Pollnow and Anna Christine Louise Gehrke) was born Abt 1836, Klein Rambin, Belgard, Pommern; died 5 Apr 1912, Bärwalde, Neustettin, Pommern. [Group Sheet]

1. Johannes Otto Erdmann Jahnke was born Abt. 1870, Bärwalde, Neustettin, Pommern; died 30 Apr 1893, Bärwalde, Neustettin, Pommern.
2. Maria Martha Jahnke was born 1 Dec 1874, Bärwalde, Neustettin, Pommern; died 4 Dec 1874, Bärwalde, Neustettin, Pommern.
3. Ida Anna Louise Jahnke was born 13 Nov 1875, Bärwalde, Neustettin, Pommern; died 14 Jan 1919, Bärwalde, Neustettin, Pommern.
4. Anna Marie Louise Jahnke was born 23 Apr 1877, Bärwalde, Neustettin, Pommern; died 14 Sep 1878, Bärwalde, Neustettin, Pommern.
5. - Jahnke was born 10 Apr 1878, Bärwalde, Neustettin, Pommern; died 10 Apr 1878, Bärwalde, Neustettin, Pommern.
6. Paul Friedrich August Jahnke was born 6 Sep 1879, Bärwalde, Neustettin, Pommern; died 21 Sep 1879, Bärwalde, Neustettin, Pommern.
7. Ernst Friedrich Wilhelm Jahnke was born 18 Aug 1881, Bärwalde, Neustettin, Pommern; died 5 Jul 1882, Bärwalde, Neustettin, Pommern.