Family #Mr22 in the 1798 Merkel census.
Family #62 in the 1834 Grimm census.
Valentin Werth was the youngest son of Heinrich Werth of the village of Merkel and his deceased wife. The surname attributed to him in the 1834 Grimm census, Werd, is spelled incorrectly. The was probably a census taker error because he couldn't differentiate between the "th" and the "d" sounds which are similar when spoken.
His father is listed 1767 Dietel census at the end of the census, in an area reserved for an additional list of Dietel colonits as per Karl Stumpp, noted author of The Emigration of Germans to Russia in the Years 1763-1862. 
At some point between 1767 and 1798, Heinrich Wirth/Werth married and eventually moved his family to Merkel. I checked a map of the Volga German colonies and found that Merkel is half way between Dietel and Grimm. After the death of his first wife, he married second wife, Elisabeth Adler, who came from Grimm. It does not seem unlikely that his son, Valentin, would one day move there.
Valentin was the youngest son of Heinrich and his first wife. When his father remarried, he had another son with his second wife. I suspect Valentin never thought he would not inherit any of his father's property, which made the offer of Martin Fritzler Sr. from Grimm appealing. Martin had no adult children who remained in his household.
Valentin was born in 1786, probably in Merkel, and at the time of the 1798 census, he was 11 years old.  By 1808 he would have been 21, possibly married, but maybe not for another two or three years. He married Anna Regina Fritzler and their first child was born in 1814. After the death of her father, Martin Fritzler Jr., with no sons to inherit his property, Valentin and his wife, Martin Jr.'s eldest daughter, joined her grandfather's household in Grimm. By the early 1800s, he was in his early 70s, unable to care for his property without help. By bringing his granddaughter and her husband Valentin into his family, this gave Martin Sr. help with the farm chores and a family to inherit the land after his death.
1834 Grimm Census 
By the time of the 1834 census, Martin Fritzler Sr. had been dead for 17 years and Valentin Werth was the defacto head of household #62, having lived in the old Fritzler home for probably more than 20 years.
It is interesting to note that by 1857, there were no Werths/Wirths/Werds left in Grimm, with the exception of daughters who married and went to live with their husbands' families. Any sons he may have had left Grimm or died before 1857.
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