Karl married Albertine Henriette Friederike Neubauer. Albertine (daughter of Franz Neubauer and Friederike Henriette Greinke) was born 27 Jan 1842, Neuhütten, Kreis Bütow, Pommern; died 27 Apr 1902, Alt Latzig, Rummelsburg, Pommern. [Group Sheet]

1. Hermann August Friedrich Heldt was born 2 Jan 1877, Alt Latzig, Rummelsburg, Pommern.
2. Robert Heinrich Albert Heldt was born 18 Sep 1879, Alt Latzig, Rummelsburg, Pommern.
3. August Carl Friedrich Heldt was born 22 Dec 1881, Alt Latzig, Rummelsburg, Pommern.
4. Adeline Hulda Emilie Heldt was born 5 May 1884, Alt Latzig, Rummelsburg, Pommern.