Mary
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- 1 Mary
- Frederick Horstmann
- 2 Christian Frederick Horstmann b. 9 Jan 1821 d. 10 Sep 1889
- Wilhelmine Gerding b. 14 Oct 1831 d. 16 Jul 1882
- 3 Louise Horstmann
- 3 Anna Marie Horstmann
- 3 William Horstmann
- 3 Johann Horstmann
- 3 August Horstmann
- 3 Emma Horstmann
- 3 Charles Horstmann
- 3 Caroline Horstmann b. 2 Aug 1854
- 3 Frederick W. Horstmann b. 19 Oct 1858 d. 21 Jun 1929
- Anna Louise Schmidt d. 1889
- 4 Johann Horstmann b. 8 Dec 1885
- 4 Oscar Horstmann b. 7 Jan 1888 d. 1973
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- 4 Johann Horstmann
- Anna M. Witte b. 3 Jun 1869 d. 12 Aug 1952
- 4 Ella Horstmann b. 1896 d. 1964
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- 4 Ella Horstmann
- 3 Heinrich C. Horstmann b. 11 Jan 1861 d. 7 Jun 1886
- 3 Louise Horstmann
- 2 (unknown) Horstmann b. Bef 1850
- 2 (unknown) Horstmann b. Bef 1850
- 2 (unknown) Horstmann b. Bef 1850
- 2 (unknown) Horstmann b. Bef 1850
- 2 Christian Frederick Horstmann