(1) He is married to Aletta van Renswoude.
They got married on July 25, 1906 at Utrecht, he was 24 years old.Source 3
(2) He is married to Cornelia Gerdina Velders.
They got married on April 12, 1916 at Utrecht, he was 33 years old.Source 4
Bruidegom: weduwnaar van Aletta van Renswoude; Bruid: weduwe van Pieter de Graaf.
vader: Jacobus Anthonie van DAM & moeder: Elisabeth EGGINK