Betje Katwijk was the eldest of the nine children of Jacob Katwijk and Sara Gobes. She was born on 1 August 1890 in Amsterdam and she was a seamstress by profession. She married only at the age of 50 in Assen the 60-year old widower of Judikje Troostwijk, Daniel van Gelder, who was born on 3 March 1881 in Assen as a son of Salomon van Gelder and Fogeltje de Lange.
The then 30-year olf Judikje Troo…