He is married to Antje Smit.
They got married on June 12, 1897 at Onstwedde, Stadskanaal, Groningen, Nederland, he was 20 years old.Source 4
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Onne Alkema | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
1897 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Antje Smit | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||

20 in 1897, gemeente Borger, Pauline Berens: Genealogienetwerk zus Greetje Berens voorheen EemslandBoekweitBoerenImmigratie
https://www.genealogieonline.nl/the-dutch-connection/I26668.php
gezinskaart Alkema-Smit scan 680148 #227 1918-1936