Gotthardt Johann Heinrich Langmann & Sophia Maria Tappendorf actually had 7 children. Sophia Leonore Maria Langmann, b: 05 Feb 1835, d: 1862 was married to Heinrich (Henry) Schoel and lived in Hall County, NE with her sister Friederica Maria Sophia Dorotheas Johana Langmann who married Wilhelm Friedrich Stehr. They were among the first group of settlers to that area of NE. When Sophia Leonore Maria Schoel died in 1862/3, the Stehr family returned to Iowa to live among her family.
Maria Sophia Hanna Langmann was born 26 May 1846 and died 9 Jan 1854 in Davenport, IA.
John's father was Johann Christian Hinnerich Langmann & mother was Anna Catharina Lenthe, Sophia's father was Christopher Tappendorf.