(1) He is married to Trijntje Jitske Steenbeek.
They got married on June 3, 1920 at Smallingerland (Fr), he was 25 years old.Source 4
(2) He is married to Aagje Steenbeek.
They got married on October 27, 1943 at Leeuwarderadeel (Fr), he was 48 years old.Source 5
Geboorteregister 1894, Gaasterland
Overlijdensregister 1966, Achtkarspelen
https://www.graftombe.nl/names/info/254414/bouma
Huwelijksregister 1920, Smallingerland