Er hat eine Beziehung mit Elisabeth de Bijl.
Kind(er):
Leonard Jansen in entry for Mary Helena Jansen, "Wisconsin Births and Christenings, 1826-1926"/ FamilySearch
Leonard Jansen in entry for Henrica P. Jansen, "Wisconsin Births and Christenings, 1826-1926"/ FamilySearch
Record for Gerard Janssen/ Ancestry.com
Leonard Jansen, "Wisconsin, Death Records, 1867-1907"/ FamilySearch