He is married to Johanna Ignatia Jacoba Nepveu van Ameide.
They got married on May 4, 1882 at Lausanne, Vaud, Zwitserl , he was 24 years old.
Child(ren):
Bron: http://genealogics.org/getperson.php?personID=I00066361&tree=LEO
en: http://gw.geneanet.org/kooler?lang=no;pz=louise+elisabeth;nz=koole;ocz=1;p=onno+joost;n=sickinghe
The data shown has no sources.