(1) He is married to Martje Houwing.
They got married on November 3, 1904 at Groningen (Gr), he was 26 years old.Source 3
(2) He is married to Tjitske van Dellen.
They got married on August 27, 1931 at Groningen (Gr), he was 53 years old.Source 4
grandparents
parents
brothers/sisters
children
Kornelis van Duinen | ||||||||||||||||||
(1) 1904 | ||||||||||||||||||
Martje Houwing | ||||||||||||||||||
(2) 1931 | ||||||||||||||||||
Tjitske van Dellen | ||||||||||||||||||
Geboorteregister Zuidhorn 1878
https://www.graftombe.nl/names/info/1271508/duinen_van
Huwelijksregister Groningen 1904
Huwelijksregister Groningen 1931