Johann Georg Langholff married Maria Magdalena Keyser, daughter of Lorentz Keyser, on 16 February 1740 in the Evangelical Church of Dörrenbach, 32 kilometers west of Karlsruhe. They had seven known children, each baptized in the same church: (1) Johannes (Christoph), on 12 December 1740; (2) Johann Michael, on 18 July 1743; (3) Johann Georg, on 17 July 1746; (4) Johann Jacob on 13 April 1749; (5) Maria Elisabetha on 1 November 1751; (6) Maria Ursula on 17 July 1754; and (7) Maria Margaretha, on 6 May 1757.
Johann Georg Langolff and his family emigrated to Russia, departing from Lübeck aboard the English frigate Love and Unity with skipper Thomas Fairfax at the helm. They arrived in Oranienbaum on 12 October 1766.
On 3 August 1767, they arrived in the Volga German colonies and settled in Kind. On the 1798 census, Johann Georg Jr. is recorded still in Kind in Household No. Kd04 with Johann Jacob in Household No. Kd17. Son Johann Michael had moved to Hummel in 1772 where he is recorded on the 1798 Census in Household No. Hu19. Descendants of son Christoph are recorded on the 1798 Census in the colony of Zürich in Households No. Zr13 and Zr53.
- 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): Hm19, Kd04, Kd17, Zr13, Zr53, Mv1271.
- Parish records of Dörrenbach (LDS Film No. 193818).
- Pleve, Igor. Einwanderung in das Wolgagebiet, 1764-1767 Band 4 (Göttingen: Der Göttinger Arbeitskreis, 2008): 377.
- Pleve, Igor. Lists of Colonists to Russia in 1766: Reports by Ivan Kulberg (Saratov: Saratov State Technical University, 2010): #5524.