Jannetta Neeltje Lobensteijn was a daughter of Johannes Lobensteijn and Jannetta Neeltje Voogt. She married 1 September 1920 in Amsterdam Gabriel van Gelder, a son of Bernard van Gelder and Julia Bloeme van Minden. The couple had four children; one son died as a baby; two children have survived the Holocaust, just like their father. However, their son Bernard has been killed during the Shoah.
City archive of Amsterdam, archive card of Gabriel van Gelder.