Christoph G. J. Mahn and Johanna F. H. Bruns had at least one child; Heinrich Christoph Frederick Mahn b. 22 June 1826, Wildemann, Germany, m. 13 Nov. 1853 Henriette Clarlotte Leibetrauth b.11 Dec. 1828 Wildemann, Germany, the daughter of Georg W.F. and Johanna C.F. Veith Leibetrauth.
They had at least two childern; Elsie Karoline Mahn b. 8 Nov, 1854 and August Ferdinand Carl Mahn b. 8 Nov 1854, Wildemann, Germany, d. 19 Apr. 1927, Stoneham, Mass. He married Therese Christine Jacobs, b.1 Oct. 1865, Oevenum, Isle of Fohr, Germany, d. 8 Aug. 1960, Stoneham, Mass. She was the daughter of Jacob D. Jacobs.
They had four children that survived to adulthood:
Clarence Henry mahn, b 2 May 1886, lived Watertown, Mass. Ralph Waldo Mahn, b 30 Aug 1887, lived Miami Fla. Fred Jacobs Mahn, b 17 Mar 1889, Lived Newton, Mass. Chester Harold Mahn, b 10 Sep 1893, Lived Roxbury, Mass. Herbert Augustus Mahn, b 25 Oct 1894, lived Norwalk, Con.