Jonas van Oosten was married to Gonda Godschalk. The couple had three sons and a daughter: Machiel, Abraham, Maurits and Hester Henderina, who was married to Denneboom.
Jonas van Oosten ran the furniture shop De Walvisch with his sons Machiel (known as Mie) and Maurits (known as Mau) on the Gedempte Singel in Assen. The shop opened in 1896. In addition to selling home furnishings, the firm arran…