Jacob Mok was a son of Machiel Philip Mok and Klara Brandon. He was born on December 8, 1875 in Haarlem and in his younger years he was a cantor and later in life he became a traveler in stationery. On 30 June 1897, he married Mietje Brandon in Amsterdam, a daughter of Isaac Jacob Brandon and Rosa Groenewout, who was born in Amsterdam on 24 February 1875. Mietje then lived at home with her parents…