Levinus Johannes Wolfaert, father of John, was born 28 December 1840 in Goes, Zeeland, the Netherlands.

Henrietta van de Rafelaar, mother of John, was born 10 April 1841 in Goes, Zeeland, the Netherlands.

Hendrik Andries Polfliet, father of Johanna, was born 25 August 1840 in Oudelande, Zeeland, the Netherlands.

Lucia Westdorp, mother of Johanna, was born 24 April 1833 in Ovezande, Zeeland, the Netherlands.