Il est marié avec Fijke Slijm.Source 3
Ils se sont mariés le 25 août 1855 à Noordbroek, Groningen, Netherlands , il avait 27 ans.Les sources 1, 3, 4
Enfant(s):
It is unknown why Geert used his mother's surname of Boekweg throughout his life, unless Lolke Werkman wasn't his father. On Geert's birth, marriage and death record, his father's name isn't given. This usually meant that the child was illegitimate. Geert's mother (Jacobjen Harms Boekweg) was married in 1823 to Lolke Pieters Werkman, four years prior to Geert's birth. Geert has an older sibling and several younger siblings that were all Lolke's children and used the surname of "Werkman".