Jacob Allerts Wiersma, born in Almenum circa 1802, son of Allert Paulus Wiersma and Ynskje Jacobs, milk retailer.

Jacob was married in Harlingen on August 18, 1831, at the age of approximately 29 to
Henderina Jacobs Steensma (aged approximately 26 years), born in Midlum circa 1805, daughter of Jacob Rientzes Steensma (tasser) and Stijntje Jacobs Hoek.