The orphaned sons of Christian Müller (Johannes, age 15; Philipp, age 13) are recorded on the 1767 census of Dönhof in Household No. 93 along with the Mattias Funk family. They had settled in the colony of Dönhof on 18 June 1767. The 1767 census does not record a relationship between the Funk and Müller families.
The 1767 census records that the Müller boys came from the German village of Runkel in the Württemberg region.
- 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): Dh023.
- Pleve, Igor. Einwanderung in das Wolgagebiet, 1764-1767 Band 1 (Göttingen: Göttinger Arbeitskreis, 1999): 366.