He is married to Maria Elisabeth Schmitz.
They got married on April 29, 1823 at Wesuwe, Haren (Ems), Landkreis Emsland, Lower Saxony, Germany, he was 34 years old.Source 3
Witness: Joan Bernd Schmitt Ackersmann zu Altharen, Rudolf Kupers Schäfer zu Hüntel
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grandparents
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Joannes Otto - Johann - Joan Veenker | ||||||||||||||||||||||||||||||||||
1823 | ||||||||||||||||||||||||||||||||||
Maria Elisabeth Schmitz | ||||||||||||||||||||||||||||||||||

Pauline Berens: Genealogienetwerk zus Greetje Berens voorheen EemslandBoekweitBoerenImmigratie
https://www.genealogieonline.nl/the-dutch-connection/I14899.php
34 in 1823, NR NAME voornaam GEBDAT TAUFDAT GEBORT Vater Name Vater Vorname Mutter Name Mutter Vorname JAAR OPMERKINGEN
Venneker Joannes Otto 17890222 17890224 Altenharen Venneker Gerardus Hütten Gesina
Veenker Johann Ackersmann vormittags 11 Uhr 18630707 1863 Osteresch 74 Jahre Altersschwäche Veenker Johann Gerhard nicht bekannt
Veenker zu Osteresche 34 J. Joan, Schmitt zu Osteresche 34 J. Elisabeth
brides parents: Schmitt Joan, Wilmes Phenna Catharina Ackerlseute zu Osteresch
grooms parents: Veenker Gerd, Hütten Gesina Ackersleute zu Altharen