He is married to Magdalena Teufel.
They got married on November 22, 1894 at Ennetach, Mengen, Sigmaringen, Baden-Württemberg, Duitsland, he was 27 years old.Sources 1, 2
Child(ren):
Ahnentafel von Ernst Rapp (Familienangaben)/ privat - Hartenthaler, Hermann - Netzlaufwerk
"Deutschland Heiraten, 1558-1929," Database, familysearch (https://familysearch.org/ark:/61903/1:1:ND9Q-DR3 : accessed 25 June 2015, Eduard Heinzler and Magdalena Teufel, 22 Nov 1894; citing Ennetach, Württemberg, Germany; FHL microfilm 1,046,954./ Internet - FamilySearch