JG
John Grady — 1940 US Census Record
Model Tree available1940 United States Federal Census · Columbia-County, Wisconsin
Our Model Tree links this John Grady across the 1920, 1930 and 1940 US Censuses in Columbia-County, Wisconsin (XGBoost, ~Confirmed), with identified parents Thomas & Julia — first a son (b.~1901), then head of a 3-person household.
Age 39
b. ~1901
Male
Son
Born: Wisconsin
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Columbia-County, Wisconsin |
| Surname | Grady |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 39 |
| Marital Status | Single |
| Birthplace | Wisconsin |
| 1935 Residence (City) | Fountain Prairie township |
| 1935 Residence (County) | Columbia |
| Additional Details | |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 15 |
| Income (1939) | 0 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | Wisconsin |
| Birth Country | United States |
| Birthplace (normalized) | wisconsin |
| Occupation | Farmer |
| Township / Ward | Fountain Prairie Township |
| Est. Birth Year | ~1901 |
Household Members
Census records only state relationship to the household head.
Pairwise kinship is derived (~90–95% accurate), not recorded.
Step/blended families and boarders can break it.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| John Grady | Son | — | 39 | ~1901 |
| Julia Grady | Head | — | 67 | ~1873 |
| Ella Grady | Daughter | — | 34 | ~1906 |
Census Appearances
1920
Columbia, Wisconsin
Son, age 19
Columbia, Wisconsin · implied b. ~1901 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Grady |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | Wisconsin |
| Father's Birthplace | Wisconsin |
| Mother's Birthplace | Wisconsin |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Wisconsin |
| Birth Country | United States |
| Birthplace (normalized) | wisconsin |
1930
Columbia, Wisconsin
Son, age 29
Columbia, Wisconsin · implied b. ~1901 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Grady |
| Given Name | John E. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 29 |
| Marital Status | Single |
| Birthplace | Wisconsin |
| Father's Birthplace | Wisconsin |
| Mother's Birthplace | Wisconsin |
| Occupation | Farm Hand |
| Industry | General Farm |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Wisconsin |
| Birth Country | United States |
| Birthplace (normalized) | wisconsin |
1940
Columbia-County, Wisconsin
Son, age 39
Columbia-County, Wisconsin · implied b. ~1901 — 3 household members
| Surname | Grady |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 39 |
| Marital Status | Single |
| Birthplace | Wisconsin |
| 1935 Residence (City) | Fountain Prairie township |
| 1935 Residence (County) | Columbia |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 15 |
| Income (1939) | 0 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | Wisconsin |
| Birth Country | United States |
| Birthplace (normalized) | wisconsin |
Model Tree
An inferred pedigree reconstructed from census links — up to 4 generations within the 1900–1950 window. Closer generations are built from household co-residence; deeper ones are bridged by following a relative to their own childhood census. Confidence compounds and weakens with each generation.
Our Model Tree links John Grady across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Thomas Grady (~0.92 confidence) and mother Julia Grady (~0.92 confidence) and mother Julia Grady (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Thomas Grady
b. ~1863
Source father
● Household
· direct · ~0.92
Mother
Julia Grady
b. ~1872
Source mother
● Household
· direct · ~0.92
Mother
Julia Grady
b. ~1873
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Grady
Son · 1940 · age 39 · b. ~1901 · Wisconsin
★ You are viewing this record
Sibling
Ella Grady
Sibling · 1940 · age 34
Source co-child of head (derived)
● Co-child · derived · ~0.88
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Columbia-County, Wisconsin
Open full size
1940 US Federal Census — Columbia-County, Wisconsin
Page Contents
30 people indexed on this census page (nara:1940:m-t0627-04466-00274)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Lena Siers | 71 | Head | — | Germany |
| 2 | Della Siers | 43 | Daughter | Housekeeper | Wisconsin |
| 3 | Carl Siers | 36 | Son | Farm Laborer | Wisconsin |
| 4 | Clarence Siers | 32 | Head | Farmer | Wisconsin |
| 5 | Lucille Siers | 29 | Wife | — | Wisconsin |
| 6 | Raymond Siers | 8 | Son | — | Wisconsin |
| 7 | Joan Siers | 7 | Daughter | — | Wisconsin |
| 8 | Russel Siers | 5 | Son | — | Wisconsin |
| 9 | Melvin Stone | 28 | Hired Hand | Farm Laborer | Wisconsin |
| 10 | John Wenzel | 50 | Head | Proprietor | Germany |
| 11 | Martha Wenzel | 43 | Wife | — | Wisconsin |
| 12 | Jane Wenzel | 17 | Daughter | — | Illinois |
| 13 | Shaw | 37 | Head | Officer | Illinois |
| 14 | Jeannette Shaw | 36 | Wife | — | Illinois |
| 15 | Lloyd Gardner | 47 | Head | Farmer | Wisconsin |
| 16 | Isabel Gardner | 41 | Wife | — | Wisconsin |
| 17 | William Gardner | 9 | Son | — | Minnesota |
| 18 | Laura Gardner | 5 | Daughter | — | Minnesota |
| 19 | David Gardner | 1 | Son | — | Wisconsin |
| 20 | Laura Aldrich | 74 | Mother-in-law | — | Wisconsin |
| 21 | Julia Grady | 67 | Head | — | Wisconsin |
| 22 | John Grady THIS PERSON | 39 | Son | Farmer | Wisconsin |
| 23 | Ella Grady | 34 | Daughter | Maid | Wisconsin |
| 24 | Guy Robbins | 58 | Head | Farmer | Wisconsin |
| 25 | William Miller | 56 | Head | Carpenter | Wisconsin |
| 26 | Clarence Tasker | 40 | Head | Carpenter | Wisconsin |
| 27 | Irene Tasker | 37 | Wife | — | Wisconsin |
| 28 | Paul Bulthuis | 25 | Head | Farm Laborer | Wisconsin |
| 29 | Margaret Bulthuis | 22 | Wife | — | Wisconsin |
| 30 | Kathleen Bulthuis | 1 | Daughter | — | Wisconsin |
Pedigree Summary
John + 1 sibling
Gen 1 · 3 parents
~0.92
Max depth 4 (1900–1950 window)
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1940 United States Federal Census (NARA). Our Model Tree links this person across census decades using XGBoost-based record linkage, with per-link confidence scores. Household corroboration strengthens the signal when co-residents appear on the same census pages in multiple years.
Source: National Archives and Records Administration (NARA)