Eugène Van Dievoet is the son of Ernest Jean-Louis Van Dievoet (Brussels, 16 July 1835 - Saint-Gilles, 28 August 1903) and Léonie Joséphine Françoise Most (Antwerp, 14 July 1838 - Brussels 1943), daughter of Ferdinand Gustave Adolphe Most and Ghislaine Philippine Pauline Delsart; and the grandson of Eugène Van Dievoet and Hortense Poelaert, sister of the famous architect Joseph Poelaert.