He is married to Sara Johanna Grothe.
They got married on October 9, 1872 at Zeist, Utrecht, Netherlands , he was 26 years old.
Child(ren):
Nederland's patriciaat
by Epen, Didericus Gijsbertus van, 1868-1930, 1919
p. 55
https://archive.org/details/nederlandspatric10epen_0/page/55/mode/1up
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Willem Aarnoud van Beeck Calkoen | ||||||||||||||||||||||||||||||||||||
1872 | ||||||||||||||||||||||||||||||||||||
Sara Johanna Grothe |
The data shown has no sources.