When Cornelia Elisabeth van Leerdam was born on 2 August 1893, in Middelburg, Zeeland, Netherlands, her father, Johannes van Leerdam, was 27 and her mother, Maria Verhage, was 35. She married Eduard Cornelis van Deventer on 8 October 1920, in Middelburg, Zeeland, Netherlands. She died on 8 April 1977, in Vlissingen, Zeeland, Netherlands, at the age of 83, and was buried in Oost-Souburg, Vlissingen, Zeeland, Netherlands.