Family #1 in 1775 Grimm census.
Anna Katharina, last name unknown for now, was born about 1740 in what is now Germany. She married a Herr Kanzler by 1771 and their son Johann Georg Kanzler was born in 1772.
There are two possibilities from immigration sources that could be a match for her first husband.
There were no Kanzlers or Kantzlers living in Grimm at the time of the first census in 1767. This means that the couple were not original settlers of Grimm. This is meaningful because most, if not all, of the Danish Germans who immigrated to Russia were placed in other villages temporarily, until the new colonies could be established. Furthermore, none of their names appear in a 1767 census, which appears to document all the new settlers, excluding the settlers from Denmark who arrived a year or two earlier. All of the known Danish Germans who are listed in the 1775 Grimm census are not listed in the 1767 Grimm census. This supports the theory that Georg Kantzler could have been the husband of Anna Katharina and father of Johann Georg, as well as the fact that the couple may have named their first child after his father.
If Solomon Kanzler was the father, then one must consider what happened to the other original three Kanzler children, since none of them were living with the their mother and Gottfried Grimm at the time of the 1775 census, and all were still too young to be living on their own in other families. Was is likely that the entire family perished, except for the mother? I've searched all the 1767 census records I have, which excludes volume 2, and can find no Solomon Kanzler listed in any of those new colonies.
Anna Katharina and her first husband had son Johann Georg Kanzler in 1772. Shortly after his birth, her first husband died. By 1775 she was remarried to Gottfried Grimm.
1775 Grimm Census 
This census reveals that Anna Katharina, Gottfried's wife at the time of this census, had a three year old child with her previous husband. This means that she cannot be the mother of any of Gottfried's children. The most likely scenario is that Gottfried's first wife and Anna Katharina's first husband did not survive the journey to the Volga River, and that the couple married between 1766 and 1767, either in Oranienbaum, Russia, or shortly after they arrived in Grimm.
Have you taken a DNA test? If so, login to add it. If not, see our friends at Ancestry DNA.
Unknown is 42 degrees from Alfred Nobel, 50 degrees from Henri Becquerel, 37 degrees from Niels Bohr, 33 degrees from Marie Curie, 43 degrees from Alec Fleming, 35 degrees from Howard Florey, 40 degrees from Albert Imre Szent-Györgyi, 33 degrees from Barbara McClintock, 42 degrees from Wilhelm Roentgen and 25 degrees from Chandra Garrow on our single family tree. Login to find your connection.