He is married to Sjoukje Lettinga.
They got married on May 10, 1917 at Grootegast (Gr), he was 30 years old.Source 3
grandparents
parents
brothers/sisters
children
Lammert Couperus | ||||||||||||||||||
1917 | ||||||||||||||||||
Sjoukje Lettinga | ||||||||||||||||||
Geboorteregister 1886, Achtkarspelen
https://www.graftombe.nl/names/info/237595/couperus
Huwelijksregister Grootegast 1917