He is married to Riemkje Oldenburger.
They got married on September 15, 1917 at Grootegast (Gr), he was 22 years old.Source 3
grandparents
parents
brothers/sisters
children
Klaas Kuiper | ||||||||||||||||||
1917 | ||||||||||||||||||
Riemkje Oldenburger | ||||||||||||||||||
Geboorteregister Oldekerk 1894
https://www.graftombe.nl/names/info/2000004/kuiper
Huwelijksregister Grootegast 1917