He is married to Hermanna Maria Kaiser.
They got married on April 17, 1926 at Emmen, Gemeente Emmen, Drenthe, Nederland , he was 26 years old.Source 3
Johan Herman de Groot | ||||||||||||||||||
1926 | ||||||||||||||||||
Hermanna Maria Kaiser |
Pauline Berens: Genealogienetwerk zus Greetje Berens voorheen EemslandBoekweitBoerenImmigratie
https://www.genealogieonline.nl/the-dutch-connection/I21500.php