A44-44 in The Immigration of German Colonists to Denmark and Their Subsequent Emigration to Russia in the Years 1759-1766.
B-710 and B-943 in The Immigration of German Colonists to Denmark and Their Subsequent Emigration to Russia in the Years 1759-1766.
Family Rus14-19 in The Immigration of German Colonists to Denmark and Their Subsequent Emigration to Russia in the Years 1759-1766.
Family #43 in the 1775 Grimm census.
Family #71 in the 1798 Grimm census.
Anton Jäger was born in 1717 in Spachbrücken. He was an Evangelical Lutheran, a day laborer working for low wages in an economically depressed area. The economic conditions were poor due to war, famine, high taxes and burdensome tithing expected by the local Church.
In 1759, the Danish government offered these Germans a chance for a new life in Denmark, helping to convert what were currently marshlands to farmable lands. Those who chose to immigrate would be given an opportunity for a brighter future via homesteaded land or through a land lottery.
Johann and his wife Eva Margaretha, also born in 1723, arrived in Flensburg with two children, Eva Margaretha Landseidelin and Elisabeth Barbara, on 09 June 1762.  They were considered reserve colonists. As of 30 September 1763, they lived at Nr. 9 in Colony G18 "Neuboerm" in the district of Gottorf. 
Turning marshlands into arable land wasn't as easy as anyone thought it would be, and all the German immigrants struggled to make a living. About the same time, Catherine the Great issued her manifesto to all Germans, inviting them to immigrate to Russia and help settle the Volga River area. It was too good an opportunity to miss, so the family deserted Denmark on 03 May 1765 and immigrated to Russia.
Anna Catharina Lanseidlelin was misnamed in document B-710 in The Immigration of German Colonists to Denmark and Their Subsequent Emigration to Russia in the Years 1759-1766 as Eva Margaretha. Eva Margaretha was the name of Anton's wife. Either the record taker misunderstood or inadvertently rewrote the first and middle names of his wife as the first and middle names of the 12-year-old child. His wife's last name at birth is not mentioned.
A check of German vital records shows that Anton Jaeger married Eva Margaretha Landzettelin. That surname is very close to Anna Catharina Landseidlelin. Further research shows that Anna Catharina was probably Eva Margaretha's younger sister, Anton's sister-in-law. She could have also been Eva's niece, but records show they had the same father. I cannot find a brother to Eva named Ludwig Landzettel.
Whether Anna Catharina was really a maid to the family is not known, but that is how she traveled with them into Denmark. Eva Margaretha and Anna Catharina's family was so poor that their parents probably thought Anna Catharina had a chance for a better life if she lived with her sister and her husband and immigrated to Denmark with them.
The last confirmation of Anna Catharina living in Denmark was 22 October 1762. It's not clear if she traveled on to Russia with the family or if she remained in Denmark. Unless she married before she was 15, which is unlikely, she probably traveled with her sister and Anton to Russia. I've not yet been able to confirm if she appears in the 1775 census in another family.
Here is Anna Catharina's birth record.
Birth Record 
There is a marriage record for an Anna Catharina Landsettelin in online German records, but it's for the year 1751, when she was only three years old. Obviously that's for an older sibling, an aunt or a cousin with the same name. 
By the time of the 1775 Grimm census, Anton Jaeger was married to his second wife, Maria Barbara, last name at birth unknown. The couple has a son together, Georg Ludwig, born in 1766. That means that his first wife, Eva Margaretha, must have passed away either before Anton Jaeger left Denmark or at some point during the journey to Russia in 1765. Neither of the girls listed in The Immigration of German Colonists to Denmark and Their Subsequent Emigration to Russia in the Years 1759-1766 are included in the census. That's okay, because by 1775 they were certainly old enough to be married and have families of their own.
There are two step-daughters listed as living with Anton in the 1775 census. These girls have a completely different surname, Finschuh, and they did not live with Anton in Denmark. My first inclination was to say fine, they must belong to his current wife and her previous husband. For that to be true, however, his current wife would have had to have two children in the same year, 1767, one of them out of wedlock, and a second out-of-wedlock child in 1772, all while she was married to Anton. That does not seem likely.
One possible scenario is that Anton must have had another wife, a marriage between Eva Margaretha and Maria Barbara, and that the girls were the product of this unknown wife's previous marriage to Mr. Finschuh. Again, the problem is the two children who were the same age, one a Finschuh and the other a Jaeger. Would Anton's second wife, name unknown, have had two children out of wedlock while she was married to Anton? Or was she married to the other man, not Anton? Or was Anton's son born out of wedlock and he only married the boy's mother after his unknown wife died?
If the unknown wife's two children are legitimate Finschuhs, is it plausible that after her husband Mr. Finschuh died around 1773, she immediately married Anton Jaeger, and then she, too, passed away, all before the 1775 census was taken which shows her husband was married to a completely different person and they had a 12-year-old child? If that is true, then it also means that her husband had the out-of-wedlock child with Maria Barbara, whom he eventually married.
There may have been a clerical error in recording the ages of the children in the 1775 Grimm census. Even if this were true, you would have to believe that both Finschuh daughters were older than son Georg, so all three of their ages would have been misrepresented.
The most reasonable explanation is that the two Finschuh girls in the 1775 Grimm census were actually his granddaughters or nieces. They could have easily been the children of his sister-in-law, Anna Catharina Landzettelin and an unknown husband. It's possible that both sisters Eva Margaretha and Anna Catharina perished before the 1775 census. The Finschuh children could also have been orphans that Anton took in and, formally or not, adopted. Many people did not survive the journey through Russia to the Volga, and there are documented cases of orphans living with unrelated people. For this to be the case, there had to be a breakdown in communication between Anton Jaeger and the census-taker about the relationship between Anton and the girls.
1775 Grimm Census 
By the time of the 1798 Grimm census, Anton had married yet another woman, Anna Barbara Hassenfuss. The census clearly states that Johann Georg Ludwig was the son of Anton's deceased wife. Hopefully it meant Maria Barbara, Anton's wife in the 1775 census. By 1798, Anton was 79 and third wife Anna Barbara was only 52. Clearly Anton had lived a full live and now needed a companion/caregiver. All the girls who had once lived with him were probably married and living with their husbands' families.
1798 Grimm Census 
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