He was born at Charly-sur-Marne in France and later called himself Sieur des Groseilliers after a farm his parents managed in Bassevelle.
According to F. René Perron of Sèvres, Germain Doucet is from La Verdure, which is 10 kilometres north of Coutran, in the Bassevelle parish, which is in Champagne Brie.