 Elvire's daughter, Janine (often spelled Jeanine), was the youngest guide of the Comet Line, first accompanying aviators by train from Paris to Bayonne when she was only 16.The usual practice of the Comet Line was for airmen and other evacuees to travel by train from Brussels or Paris with an escort, often Andree de Jongh, to either Bayonne or Saint-Jean-de-Luz.Both cities were near the de Greef's home.