He is married to Maria Aleida Hartmann.
They got married on November 10, 1928 at Emmen, Gemeente Emmen, Drenthe, Nederland, he was 27 years old.Source 4
Child(ren):
grandparents
parents
brothers/sisters
children
Rudolf - Roelf Feringa | |||||||||||||||||||||||||||||||||||||
1928 | |||||||||||||||||||||||||||||||||||||
Maria Aleida Hartmann | |||||||||||||||||||||||||||||||||||||

Pauline Berens: Genealogienetwerk zus Greetje Berens voorheen EemslandBoekweitBoerenImmigratie
https://www.genealogieonline.nl/the-dutch-connection/I1774.php
naturalisatie 1950
https://repository.overheid.nl/frbr/sgd/19491950/0000085893/1/pdf/SGD_19491950_0002070.pdf
Rudolf Feringa bidprentje https://www.online-begraafplaatsen.nl/graf/1321984/2045050/Maria-Aleida-Hartmann-1898-1989