(1) He is married to Neeltje van Dijk.
They got married on May 8, 1919 at Oostdongeradeel, Friesland, Nederland, he was 27 years old.Source 3
(2) He is married to Antje Okkema.
They got married on October 13, 1932 at Oostdongeradeel, Friesland, Nederland, he was 40 years old.Source 4
Geboorteregister 1892, Oostdongeradeel
https://www.graftombe.nl/names/info/396336/meindertsma
Huwelijksregister 1919, Oostdongeradeel
Huwelijksregister 1932, Oostdongeradeel