(1) He is married to Grietje van der Roovaart.
They got married about 1905.Source 1
The couple were divorced in 1923.Source 1
(2) He is married to Maartje Mostert.
They got married on December 24, 1924 at Maasland (ZH) , he was 41 years old.Source 2
(3) He is married to Magdalena Verhoog.
They got married on January 30, 1959 at Monster, Westland (ZH) , he was 75 years old.Source 1
ouders: Johannes Matthijs Koch & Hendrina Sinjou