He is not mentioned specifically, but his daughter Maria Katharina Ruppel is listed as the step-daughter of Heinrich Jakob Erdmann. This surname, Ruppel, appears to be spelled incorrectly. It should have been Happel. Johannes Happel is the only Happel brother who is noted in the 1834 census but doesn't appear in the 1857 census. He was most likely the father of Maria Katharina Ruppel.
His daughter's name appears in the 1857 census for the Erdmann family, while his two older children appear in the Happel census entry. Both entries are shown below.
Head of the Household Johann Georg Happel, age 59 in 1850, deceased 1857
Child #1 Johann Jakob Happel, age 36
Wife of Child #1 Katharina Happel, age 27
Grandchild #1 Christina Margaretha Happel, age 10
Grandchild #2 Johann Peter Happel, age 7
Grandchild #3 Elisabeth Happen, age 4
Child #2 Christoph Happel, age 34
Wife of Child #2 Katharina Margaretha Happel, age 29
Child #3 Philipp Happel, age 32
Wife of Child #3 Katharina Happel, age 27
Grandchild #6 Christina Margaretha Happel, age 4
Grandchild #7 Katharina Happel, age 2
Child #4 Johann Georg Happel, age 31
Child #5 Johann Heinrich Happel, age 30
Unnamed Son (possibly Johannes who would have been 42 in 1857)
Grandchild #8 Katharina Elisabeth Happel, age 18, grandchild by an unknown son
Grandchild #9 Georg Jakob Happel, age 14, grandchild by an unknown son
A footnote says that the last two children are not necessarily siblings, "according to the way they are listed." I'm not certain what necessitated that comment. To believe that they are not siblings, you would have to believe that one son of Johann Georg Happel is not listed in the 1834 census and two sons are missing from the 1857 censuses. Only one son, Johannes, is missing based on Johann Georg's children in the 1834 census. Even if Johann Georg had another child after 1834, that child would not be old enough to have an 18-year-old daughter in 1857. Johannes Happel is the most likely candidate as the father for the three Happel children.
1857 Census of Grimm in the District of Saratov, Russia, dated 5 November 1857; Translated by Brent Mai, Concordia University, Portland, Oregon; Published by Dynasty Publishing, Beaverton, OR, USA; Published 2005; page 54, family #145, Balthasar Erdmann family.
↑1857 Census of Grimm in the District of Saratov, Russia, page 54, family #144,