When Johann Georg Beilharz was born on 21 July 1870, in Schwarzwaldkreis, Württemberg, Germany, his father, Johann Georg Beilharz, was 34 and his mother, Christiane Schanz, was 28. He married Christiana Schübel on 7 May 1903, in Vesperweiler, Cresbach, Freudenstadt, Württemberg, Germany. They were the parents of at least 2 sons and 1 daughter. He died on 14 November 1939, in Hörschweiler, Freudenstadt, Württemberg, Germany, at the age of 69.