He is married to Grietje Elisabeth Müter.
They got married on April 29, 1887 at Emmen, Gemeente Emmen, Drenthe, Nederland, he was 29 years old.Source 4
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Hendrik Petrus Grommel | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
1887 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Grietje Elisabeth Müter | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||

Pauline Berens: Genealogienetwerk zus Greetje Berens voorheen EemslandBoekweitBoerenImmigratie
https://www.genealogieonline.nl/the-dutch-connection/I11471.php
2-11-1926 Hendrik Petrus Grommel 68j m.v. Marg. Elis. Müter
V-D-17