He is married to Elisabeth von Landsberg.
They got married
Child(ren):
https://www.geni.com/people/Gerlach-Iii-von-Kerssenbrock/6000000042736124509
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Geschichte der Westphälischen Geschlechter
by Anton Fahne
Publication date 1858
p. 250
7https://archive.org/details/bub_gb_Q4hMAAAAcAAJ/page/n237/mode/1up
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The data shown has no sources.