They had the following children:

• Johanna Henriėtte (2 Dec 1924, Semarang, Indonesia - 20 Sep 1946, Semarang, Indonesia)
• "Theo"

Notes:

• Johan Godfried was in the army during World War II and fought to protect the Dutch Indies from the Japanese. He was captured and taken to a POW camp in Batavia (Jakarta, Indonesia), where he eventually succumbed to pulmonary tuberculosis. He is buried in the Petamburan cemetery in Batavia. This is his camp card:
• The last name of Johan Godfried is a combination of his ancestors' last names (his father changed his last name from Bouman to Rubaij Bouman, Rubaij being the last name of his grandfather's wife). [3] I personally don't know why, but it sure makes it easy to find descendants, with "Bouman" being a very common surname.
• The Bouman, Koker, and de Bruijn families were very heavily involved with the military and sugar plantation industry in Indonesia, going back to the 1820s or further.

Sources:

1. "Familiebericht". "Sumatra-courant : nieuws- en advertentieblad". Padang, 07-01-1899. Geraadpleegd op Delpher op 08-08-2016, http://resolver.kb.nl/resolve?urn=ddd:011188562:mpeg21:a0006
2. "Familiebericht". "Bataviaasch nieuwsblad". Batavia, 28-03-1903. Geraadpleegd op Delpher op 08-08-2016, http://resolver.kb.nl/resolve?urn=ddd:011033564:mpeg21:a0066
3. "Nederlandsche staatscourant". Landelijk, 28-06-1920, Geraadpleegd op Delpher op 08-08-2016, http://resolver.kb.nl/resolve?urn=MMKB08:000179096:mpeg21:p008
4. Min. van Binnenl. Zaken: Stamboekgegevens KNIL-militairen met Japanse Interneringskaarten 1942-1996, (Japan), archive 2.10.50.03, inventory number 448