He is married to Fettje de Vries.
They got married on May 15, 1880 at Ooststellingwerf, Friesland, Nederland, he was 25 years old.Source 3
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Willem Harder | ||||||||||||||||||||||||||||||||||||
1880 | ||||||||||||||||||||||||||||||||||||
Fettje de Vries | ||||||||||||||||||||||||||||||||||||
25 in 1880, 74 in 1929, Pauline Berens: Genealogienetwerk zus Greetje Berens voorheen EemslandBoekweitBoerenImmigratie
https://www.genealogieonline.nl/the-dutch-connection/I23519.php