They had the following children:

• Adrianus Cornelis "Adrie" (17 Sep 1918, Surabaya, Indonesia - Aug 2006, Geneva, Switzerland)
• Hendrika Susanna "Suus" (27 Oct 1920, Indonesia - May 2011, Australia)
• Elisabeth Hendrika "Els" (30 Jul 1922, Semarang, Indonesia - Dec 2004, Netherlands)
• Johanna Christina "Annie" (30 Jul 1922, Semarang, Indonesia - Feb 8 2007, Warmond, Netherlands)
• Gezina "Gees" (23 Sep 1929, Surabaya, Indonesia - Sep 2006, Netherlands)

Notes:

• A cute picture of all their children together (standing: Adrie, seated from left to right: Suus, Annie, Els, and Gees) This picture is from a family reunion in 1995 in the Netherlands. As my cousin said, this was the reunion of "Oma wel en oma niet", because Els and Annie looked so much alike, and even the grandchildren weren't able to tell them apart all the time.
• Witnesses at Johanna Christina's birth: Christiaan Gijzelaar, merchant, 58 years old, living in Medemblik & Felix Charles Geerling, priest, 35 years old, living in Medemblik
• Witnesses at Adrianus Cornelis's birth: Willem Cornelis Spoel, bediende, 31 years old, living Potgieterstraat 1 Amsterdam & George Friedrich Johannes Meij, bediende, 25 years old, living Egelantiersstraat 136 Amsterdam

Sources:

1. "Netherlands, Noord-Holland, Civil Registration, 1811-1950." Database with images. FamilySearch. http://FamilySearch.org : 14 June 2016. Noord-Hollands Archief, Haarlem (Noord-Hollands Archives, Haarlem).
2. "Famillieberichten.". "Algemeen Handelsblad". Amsterdam, 23-11-1917. Geraadpleegd op Delpher op 08-08-2016, http://resolver.kb.nl/resolve?urn=ddd:010656221:mpeg21:a0166