When Valentine van Overbeke was born on 3 March 1884, in Saint-Josse-ten-Noode, Brussels, Belgium, her father, Édouard van Overbeke, was 28 and her mother, Adèle Otto de Mentock, was 24. She married Emmanuel de Hennin de Boussu Walcourt in 1905. They were the parents of at least 1 daughter. She died in 1984, in her hometown, at the age of 100.