He is married to Trijntje Ernstes Bruinsma.
They got married on May 14, 1914 at Opsterland, Friesland, Nederland , he was 28 years old.Source 3
https://allefriezen.nl/zoeken/deeds/b84788ad-ca61-1663-aeab-d082622a514a?person=83277930-5e5a-71fb-c7c4-0b9c83e893b9
https://www.delpher.nl/nl/kranten/view?coll=ddd&query=%28jan+stoker+bruinsma%29&cql%5B%5D=%28date+_gte_+%2201-09-1973%22%29&cql%5B%5D=%28date+_lte_+%2210-02-1974%22%29&facets%5Btype%5D%5B%5D=familiebericht&redirect=true&identifier=ddd:010619522:mpeg21:a0196&resultsidentifier=ddd:010619522:mpeg21:a0196&rowid=1
https://allefriezen.nl/zoeken/deeds/d587c5f4-b9f6-52e0-365c-afd6882f1995?person=3272663d-6661-7558-d743-c64b8f6cec90