He is married to Klaaske Bosch.
They got married on May 17, 1923 at Oostdongeradeel, Friesland, Nederland, he was 23 years old.Source 3
grandparents
parents
brothers/sisters
children
Siebe de Graaf | ||||||||||||||||||
1923 | ||||||||||||||||||
Klaaske Bosch | ||||||||||||||||||
Geboorteregister 1900, Kollumerland c.a.
https://www.graftombe.nl/names/info/626209/graaf_de
Huwelijksregister 1923, Oostdongeradeel