I’m not related to any member of this family.
1940 is the last available census at this time.
Facts you should know about the early census records -
All census records [1790 – 1840] prior to the 1850 census ONLY listed the head of household; whether male or female.
NO specific age was stated for any family member
NO place of birth was stated – city, state, or country
NO city, town, or village is stated – only the county; however some census takers listed the township
NO street address was stated
NO marital status was stated – single, married, widowed, or divorced
NO family relationship was stated – brother, sister, cousin, son, daughter, wife, inlaw, etc…
NO occupation was stated
NO parental birthplaces are stated
NO race was stated [but assume “white”]
1850, 1860 & 1870 census records do not show family relationships, marital status or parental birthplaces.
Step children are not enumerated as “step” children
Adopted children are not enumerated as “adopted”
Grand children are not enumerated as “grand children”
Orphaned children were not enumerated as "orphan"
1850 is the 1st census that shows all family members
1880 is the 1st census that shows parental birthplaces and family relationships +++
Wisconsin, Births and Christenings Index, 1826-1908
Name: Watson Adelbert Davidson
Birth Date: 4 Jun 1865
Birth Place: Berlin, Green Lake, Wisconsin
Father's Name: James Madison Davidson
Father's Birth Place: Battleborough, Vermont
Mother's Name: Achsah Castor
Mother's Birth Place: Syracuse, New York
Name: Achsah Daraielsen
Age in 1860: 32
Birth Year: abt 1828
Birthplace: New York
Home in 1860: Berlin, Green Lake, Wisconsin
Post Office: Berlin
Banres Daraielsen 46, VT - farmer
Achsah Daraielsen 32, NY
Elizabeth Daraielsen 14, NY
Henry Daraielsen 12, NY
Mary Daraielsen 9, WI
James Daraielsen 7, WI
Achsah Daraielsen 6, WI 
Minnie Daraielsen 1, WI
Davidson family is not listed.
Don't you have the marriage relationship BACKWARDS?
Achsah Davidson's brother was James DAVIDSON and not James Castor