(1) He is married to Elizabet Gezina Donker.
They got married on January 16, 1870 at Lemsterland, Friesland, he was 25 years old.Source 2
(2) He is married to Arendina ter Burg.
They got married on March 10, 1882 at Avereest, Overijssel, he was 37 years old.Source 3
(3) He is married to Alida Sam.
They got married on August 20, 1890 at Amsterdam, he was 46 years old.Source 4
ook Ouwendag, ouders Tjeerd Oudendag en Sara Modders (bron huw akte)
Ouendag
ouders Harmanus Sam en Helena Hendrika Duurling