(1) He is married to Katrina Derks Knol.
They got married on April 3, 1841 at Kantens, Gemeente Eemsmond, Groningen, Netherlands .Source 2
(2) He is married to Hilje Derks Knol.
They got married on November 4, 1845 at Kantens, Gemeente Eemsmond, Groningen, Netherlands .Source 3
Vader Julle Klaassen Venhuizen (landbouwer)
Moeder Trijntje Reinders Elema (landbouwersche)