Family #7a in the 1767 Grimm census.
Family #106 in the 1798 Grimm census.
Family #204 in the 1834 Grimm census.
According to the 1767 Grimm census, Nikolaus and Eva Seibel were orphans, the children of Adam Seibel. They lived with Nikolaus Heimbuch and his wife Katharina. The 1798 census reveals that Katharina's surname was also Seibel. This most likely means that Nikolaus and Eva were Katharina's younger brother and sister.
There is no Adam Seibel in the Kulberg Reports. I searched through all the recorded Seibel and Seib entries without finding Adam and his family.
Nikolaus' sister Eva is listed in the 1798 census with family #41, as Eva Maria Seibel, wife of Michael Rollman from Dietel. Michael Rollman was her second husband. In the 1775 census she is listed with her first husband Karl Folmer in family #128. The couple had no children in 1775, but by 1798, Michael Rollmann was step-father to three children by Folmer: Johann Heinrich, Gottfried and Johann Daniel.
Nikolaus and the Heimbuch family appear to be missing from the 1775 census in error; they reappear in the 1798 census, with Nikolaus in family #106, and in the 1834 census in family #204.
Nikolaus married Anna Maria Albrandt by 1782, and their first child was born the following year. The couple went on to have seven documented children:
By the time of the 1834 census, Nikolaus was almost 80; he was not listed in the 1857 census, so he died at some point before that year. Since men's deaths were tracked in the Russian census records, he probably died before 1850, the year of the male-only, interim census. Once the death was noted in a census, it was not repeated in the following census. Had he died between 1850 and 1857, his name would have appeared in the 1857 census followed by the year of his death. Since his name does not appear in the 1857 census, even to note his death, he most likely died prior to 1850.
1767 Grimm Census 
1798 Grimm Census 
1834 Grimm Census 
Nikolaus Seibel is not listed in the 1857 census;  he most likely passed away before 1850, where his death would have been noted in the male-only census that came out that year. Had he survived, he would have been 101 years old.
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