Johann Georg Pfeifer and Catharina Fries were married 6 May 1751 in Bruchköbel, Hanau. He was from Bruchköbel and she was from Niederrodenbach. They had three children in Bruchköbel prior to departing for Russia: Anna Maria, Johannes, and Jacob. Both parents and the youngest child died during the trip to Russia. Orphans Anna Maria and Johannes were placed with separate households according to the Kolb census of 1767.
Parish records of Bruchköbel, HanauLand, Archive of the Evangelical Church of Kurhessen-Waldeck in Kassel (Archion.de)