Wilhelmus married Gerarda Johanna Lautenschlager. Gerarda (daughter of Frederikus Lambertus Lautenschlager and Gerarda Johanna Artseelen) was born on 17 Jun 1911 in Nijmegen, Gelderland, NLD; died on 9 Jun 1948 in Ubbergen, Gelderland, NLD. [Group Sheet]

1. Joseph Frederik de Haas was born in Nov 1936; died on 14 Apr 1938 in Nijmegen, Gelderland, NLD.
2. Wilhelmina Geertruida de Haas was born in Jul 1941; died on 19 Jun 1942 in Nijmegen, Gelderland, NLD.