Il est marié avec Magdalena Susanna Esterhuisen.
Ils se sont mariés le 9 août 1912 à Standerton, Transvaal, South Africa, il avait 33 ans.Source 1
The couple was married in the Standerton Magistrate Office by Special License
At the time of his death William was an Engineer by profession.
"South Africa, Transvaal, Probate Records from the Master of the Supreme Court, 1869-1958", database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QPST-YBPS : 6 September 2019), Magdalena Susanna Esterhuis Heddon, .