He is married to Henderina Letteboer.
They got married on January 8, 1873 at Grijpskerk (Gr), he was 23 years old.Source 3
grandparents
parents
brothers/sisters
children
Jan Alberts Helmus | ||||||||||||||||||
1873 | ||||||||||||||||||
Henderina Letteboer | ||||||||||||||||||
Geboorteregister 1849, Kollumerland c.a.
https://nl.findagrave.com/memorial/74958357/john-helmus
Huwelijksregister Grijpskerk 1873