The widow and children of Peter Petri are recorded on the 1798 census of Schönchen in Household No. Sn41.
The 1798 census records that Peter's son Martin is working in the colony of Biberstein.
- 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): Sn41.