Married to:  Catharina Harmens Kooiker, daughter of Harmen Deddes Kooiker and Mintje Hendriks "Mintje" Boertje.Born 17 Jan 1858 Wijckel (birth declaration: 18 Jan 1858), died 7 Nov 1932 Blauwhuis, age 74 years, buried Blauwhuis Child: 1. Mina GrondstraBorn 29 Jun 1885 Woudsend, died 20 Feb 1964 Heerlen, age 78 years, buried Dordrecht | |||
