Harm was married to Roelfke Kat, born circa 1872 (?), woman worker.
From this marriage:
1 : Tietje de Boer, born in Tolbert circa 1895 (?).
Tietje was married in Leek on June 23, 1917, at the age of approximately 22 to Ale van Wieren (aged 30 years), born in Veenwouden on November 26, 1886, son of Gerben Egberts van Wieren (worker) and Dieuwke Ales Boersma (woman worker), worker.