Albert van der Sluis, born in Harlingen on May 31, 1901, son of Okke van der Sluis (workman and docker) and Antje Tigchelaar, apprentice engine driver.

Albert was married in Harlingen circa April 1926, at the age of 24 to
Dieuwke Janke Zijlstra (aged 24 years), born in Franeker on January 8, 1902.