She is married to Hendrikus Gerrit Olthof.
They got married on July 13, 1916 at Lichtenvoorde, Gelderland, Netherlands , she was 42 years old.Source 1
marriage record: Hendrikus Gerrit Olthof & Johanna Hendrika Catharina Sterenborg; Date: Thursday, 13 Jul 1916, Lichtenvoorde, Gelderland, Netherlands; Accessed: 23 May 2015, reg. no. 9095, rec. no. 24, rec. date: 13 Jul 1916, rec. place: Lichtenvoorde