Jacob Gräf married Anna Eva Baslern, daughter of Caspar & Anna Margaretha Baslern, on 10 January 1752 in the Evangelical Church of Spöck, today a borough of Karlsruhe city. Anna Eva had been baptized on 26 May 1729 in the same church.
They had four known children, each baptized in Spöck: (1) Eva Catharina, on 11 November 1752; (2) Jacob, on 10 May 1754; (3) Catharina Margaretha, on 22 July 1756; and (4) Martin, 21 April 1759.
Jacob Gräf and his family emigrated to Denmark. They departed from Altona, Duchy of Holstein, on 5 May 1761 under the leadership of Johann Andreas Kirchhof, and arrived in the city of Schleswig, Duchy of Schleswig, on 9 May 1761. They remained in Denmark until July 1763. Son Martin next appears on the 1798 Census in the Volga German colony of Schilling recorded Household No. Sg001.
- Eichhorn, Alexander. The immigration of German colonists to Denmark and their subsequent emigration to Russia in the years 1759-1766 (Deiningen, Germany: Steinmeier, 2012): 256 & 422/23.
- Mai, Brent Alan. 1798 Census of the German Colonies along the Volga: Economy, Population, and Agriculture (Lincoln, NE: American Historical Society of Germans from Russia, 1999).
- Parish records of Spöck (LDS Film No. 1238306).