Family #20 in the 1767 Grimm census.
Family #134 in the 1775 Grimm census.
Family #Sp34 in the 1798 Stephan census.
Johannes Balzer was born about 1761, probably in the Darmstadt area, to Johann and Anna Balzer. 
Because of the limited financial and social opportunities in the Darmstadt area, his parents decided to immigrate to Russia. His father Johann Balzer is named in the Kulberg Reports as immigrating to Russia with his wife Anna.
He was a Lutheran, a tailor from Darmstadt, traveling with document number 2393.  Also traveling with the couple were children Andreas, 21, Anna 18, Elisabeth 14, and Johann, 5.
The family left Luebeck on the Pink Lev and arrived in Russia on 22 July 1766.
Typically the families took their oaths of allegiance and were settled in temporary housing barracks until the following spring, when groups set out for the Volga River colonies. At some point after their arrival in Russia but before the first Grimm census in 1767, his father Johann passed away. 
At the time of the 1767 census, his mother is listed as a widow with only two of her children, Johannes, age 6 years 6 months, and Elisabeth, age 15 years 5 months.
Head of the Household Anna Balzer, age 49, widow, Lutheran from Darmstadt
Child #1 Johannes Balzer, age 6 years 6 months
Child #2 Elisabeth Balzer, age 15 years 6 months
His brother Andreas is listed in another family, but his sister Anna, who would have been 19-20, remains missing. Although she, too, may not have survived the journey, it's more likely that she married a fellow traveler and is listed in the census with his family. The most likely family in the 1767 Grimm census is one that lived just three houses away from her mother:
"23. Christian Heinrich Heilm, 39, Lutheran farmer from Pommern. Wife: Anna Maria, 20" 
His brother Andreas lived further away in family #53, but perhaps that was closer to his wife Anna Margaretha's family, whose last name at birth in not recorded in any census records. His age is off based on his age one year earlier in the Kulberg Reports, which was 21, but that is likely a census taker or transcription error.
"58. Andreas Balzer, 20 [sic], Lutheran craftsman from Darmstadt; Wife: Anna Margaretha age 26."
In 1775, Johannes Balzer and his mother lived with his brother Andreas and his family.
Johannes Balzer followed his sister Elisabeth to the colony of Stephan.
Although his sister Elisabeth had married Simon Stürtz
and moved their by 1770, Johannes did not follow her until after the 1775 Grimm census. The separation of the twp pairs of children at this point suggests that perhaps their mother died shortly after the 1775 census, and without a living parent in Grimm, the move to Stephan, a village much further south near Dobrinka, was an easier decision for Johannes to make.
Johannes moved to Stephan and married Anna Maria Schmidt, the widow of Konrad Just.
According to the 1798 Stephan census, Johannes was 39 years old, giving him a birth year of 1759, not 1761. 
His first child was born in 1779, presumably in Stephan, so it appears that he married his wife and moved to Stephan between 1776 and 1778.
Johannes Balzer had two step-sons who were still living with their mother and him at the time of the 1798 census:
Head of the Household Johannes Balzer, age 39, from Grimm
Wife Anna Maria Schmidt, age 48, deceased husband Konrad Just
Child #1 Johannes Balzer, age 19
Child #2 Christian Ernst Balzer, age 12
Child #3 Johann Andreas Balzer, age 9
Child #4 Eva Elisabeth Balzer, age 17
Child #5 Barbara Katharina Balzer, age 14
Child #6 Johann Konrad Just, age 28, step son of Johannes Balzer
Child #7 Johann Balthasar Just, age 24, step son of Johannes Balzer
Pleve, Igor; Lists of Colonists to Russia in 1766, "Reports by Ivan Kulberg;" Saratov State Technical University, Saratov, Russia; published in Saratov 2010; page 167, Johann Balzer, Lutheran, tailor from Darmstadt, document number 2393, wife Anna, children: Andreas, age 21; Johann, age 5, Anna, age 18, and Elisabeth, age 14.
↑ 2.02.1 Pleve, Igor. Einwanderung in das Wolgagebiet 1764-1767, Band 2, Herausgegeben von Alfred Eisfeld under Mitarbeit von Sabine Eichwald, Published by the Nordost-Instsitut - 38085 Göttingen, 2005; page 76, family #20. Anna Balzer, age 49, widow, Lutheran from Darmstadt; Son: Johannes, age 6.5; Daughter: Elisabeth, age 15.5.
↑Einwanderung in das Wolgagebiet 1764-1767, Band 2, page 76, family #23, Christian Heinrich Heilm, age 39, Lutheran farmer from Pommern; wife Anna Maria, age 20.
Pleve, Igor. Einwanderung in das Wolgagebiet 1764-1767, Band 2, Herausgegeben von Alfred Eisfeld under Mitarbeit von Sabine Eichwald, Published by the Nordost-Instsitut - 38085 Göttingen, 2005; page 81, family #58, Andreas Balzer, age 20, Lutheran carftsman from Darmstadt, wife Anna Margaretha Balzer, age 26.
↑The 1775 and 1798 Census of the German Colony on the Volga, Lesnoy Karamysh, also known as Grimm; Published by the American Historical Society of Germans from Russia, Lincoln, Nebraska, USA; Published date: 1995; family #134 in the 1775 Grimm census, Andreas Balzer family.
Mai, Brent Alan; 1798 Census of the German Colonies along the Volga, Volume 1; American Historical Society of Germans from Russia, Lincoln, Nebraska; Published 1999 and 2005; page 972, Sp34, Johannes Balzer, age 39, from Grimm, married to Anna Maria Schmidt, widow of deceased husband Konrad Just. Father of Johannes, Christian Ernst, Johann Andreas, Eva Elisabeth, and Barbara Katharina. Stepfather to Johann Konrad Just and Johann Baltasar Just.
↑ Brent Mai, 1798 Census of the German Colonies along the Volga, Volume 1, page 969, Sp11, Elisabeth Balzer, age 47, from Grimm, wife of Simon Stürtz, age 51, mother of Johann Heinrich, Johann Andreas, Johannes, Heinrich Wilhelm, Johann Konrad, Johann Jakob, Anna Margaretha, Katharina Elisabeth, and Maria Elisabeth.
Mai, Brent Alan; 1798 Census of the German Colonies along the Volga, Volume 1, page 972, Sp34, Johannes Balzer, age 39, from Grimm, married to Anna Maria Schmidt, widow of deceased husband Konrad Just.
Mai, Brent Alan; 1798 Census of the German Colonies along the Volga, Volume 1; American Historical Society of Germans from Russia, Lincoln, Nebraska; Published 1999 and 2005; page 973, family #Sp34, Johannes Balzer family.