I found the following on Ancestry.com. I hope this is helpful.
Ralph Barhorst
Descendants of Johan Heinrich Hartke
Generation 1
1. JOHAN HEINRICH HARTKE was born in 1724. He married ANNA GESINA WASSENBURG. She was born in 1724.
Johan Heinrich Hartke and Anna Gesina Wassenburg had the following child:
2. i. CLEMEN2 HARTKE was born on 20 Sep 1756 in Lower Saxony, Niedersachsen, Germany. He died on 13 May 1813 in Lower Saxony, Vechta, Niedersachsen, Germany. He married Maria Catherine Pille on 28 Oct 1783 (St. Gertrude Catholic Church, Lohne Oldenberg Germany). She was born in 1760 in Lower Saxony, Vechta, Niedersachsen, Germany. She died on 28 Apr 1813 in Lower Saxony, Vechta, Niedersachsen, Germany.
Generation 2
2. CLEMEN2 HARTKE (Johan Heinrich1) was born on 20 Sep 1756 in Lower Saxony, Niedersachsen, Germany. He died on 13 May 1813 in Lower Saxony, Vechta, Niedersachsen, Germany. He married Maria Catherine Pille on 28 Oct 1783 (St. Gertrude Catholic Church, Lohne Oldenberg Germany). She was born in 1760 in Lower Saxony, Vechta, Niedersachsen, Germany. She died on 28 Apr 1813 in Lower Saxony, Vechta, Niedersachsen, Germany.
Clemen Hartke and Maria Catherine Pille had the following child:
3. i. GERHARD HENRICH3 HARTKE was born on 20 Dec 1783 in Lower Saxony, Vechta, Niedersachsen, Germany. He died on 19 Dec 1843 in Lower Saxony, Vechta, Niedersachsen, Germany. He married Maria Gertrude Busse, daughter of Johan Otto Busse and Catherine Elisabeth Uptmoer on 14 Jan 1817 in Lohne, Germany. She was born on 23 Jan 1790 in Lohne, Germany. She died on 17 Jan 1857 in Teutopolis, Effingham, Illinois, USA.
Generation 3
3. GERHARD HENRICH3 HARTKE (Clemen2, Johan Heinrich1) was born on 20 Dec 1783 in Lower Saxony, Vechta, Niedersachsen, Germany. He died on 19 Dec 1843 in Lower Saxony, Vechta, Niedersachsen, Germany. He married Maria Gertrude Busse, daughter of Johan Otto Busse and Catherine Elisabeth Uptmoer on 14 Jan 1817 in Lohne, Germany. She was born on 23 Jan 1790 in Lohne, Germany. She died on 17 Jan 1857 in Teutopolis, Effingham, Illinois, USA.
Gerhard Henrich Hartke and Maria Gertrude Busse had the following children:
i. JOSEPH4 HARTKE was born on 10 Oct 1817 in Lower Saxony, Vechta, Niedersachsen, Germany. He died on 18 May 1905 in Teutopolis, Effingham County, Illinois, USA.
ii. JOSEPHINA HENRIETTA HARTKE was born on 16 Jan 1820 in Lower Saxony, Niedersachsen, Germany.
iii. ANTONIUS HARTKE was born on 27 Oct 1822 in Lower Saxony, Vechta, Niedersachsen, Germany. He died in Oct 1825 in Lower Saxony, Vechta, Niedersachsen, Germany.
iv. ANTONIUS HARTKE was born on 27 Apr 1826 in Lower Saxony, Niedersachsen, Germany. He died in 1860 in Springfield, Sangamon, Illinois, USA.
v. JOHANN HARTKE was born on 08 Apr 1829 in Lower Saxony, Niedersachsen, Germany. He died on 05 Feb 1910 in Teutopolis, Effingham County, Illinois, USA.
vi. JOHN HARTKE was born on 04 Aug 1829 in Lower Saxony, Vechta, Niedersachsen, Germany. He died on 02 May 1910 in Teutopolis, Effingham, Illinois, USA.
vii. CLEMENS HARTKE was born on 02 Jan 1833 in Lower Saxony, Vechta, Niedersachsen, Germany. He died on 16 Jan 1896 in Teutopolis, Effingham, Illinois, USA.