1. | Martinus van Walsum was born about 1873 in Delfshaven. Martinus married Johanna Ketz on 8 Aug 1894 (burgerlijk huwelijk) in Rotterdam. Johanna (daughter of Dirk Bernardus Ketz and Derkje Wentink) was born on 27 Feb 1874 in Kralingen. [Group Sheet] [Family Chart] |