Family #17 in the 1798 Grimm census.
Family #61 and #301 in the 1834 Grimm census.
No wife is listed in either census. There are two entries for him in the 1834 census. The first is with his brother Johann Jakob Legler's family #61, and the second his with his brother Johann Heinrich Legler's family #301.
In family #61, he has no wife and one son, Jakob Alexander Legler, who was born in 1813. Jakob Alexander was three years old when he moved with his father to family #301. By the time of the 1834 census, he was 22 years old.
There is still no wife or mother listed in family #301, but Johann Heinrich Legler has two additional children in 1834, two girls. I infer from this that these girls do not have the same mother as their brother, but nothing has been proven yet.
It is possible that Heinrich Legler's son had a different mother from his daughters. There is a six-year age gap between his son, the eldest, and his daughter Maria Elisabeth. Marie Elisabeth's sister, Christina Elisabeth was born one year later.
It is also possible that the mother or mothers of Heinrich Legler's children passed away well before the census was taken.
When death years are mentioned in the census records, it is usually only for male citizens. The census frequently identifies widowers, but does not do so in the case of Heinrich Legler. I'm not sure if it is an error, if Heinrich Legler never married the mothers of his children, or if they were not mentioned because they were both dead and women's death dates weren't considered important during that period of time.
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