JG
John Grady — 1940 US Census Record
Model Tree available1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this John Grady across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed), with identified parents James & James — first a son (b.~1911), then head of a 3-person household.
Age 29
b. ~1911
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Grady |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 29 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | CHICAGO CITY |
| 1935 Residence (County) | COOK |
| Additional Details | |
| Occupation | Radiator Assembler |
| Industry | Radiator and Tractor Works |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1100 |
| Highest Grade | H 8 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Radiator Assembler |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1911 |
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 | — | 29 | ~1911 |
| Melvina Grady | Head | — | 62 | ~1878 |
| Russell Grady | Other | — | 63 | ~1877 |
Census Appearances
1920
Cook, Illinois
Son, age 9
Cook, Illinois · implied b. ~1911 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Grady |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 9 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Michigan |
| Mother's Birthplace | Michigan |
| Speaks English | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Cook, Illinois
Son, age 19
Cook, Illinois · implied b. ~1911 — 4 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 | Illinois |
| Father's Birthplace | Michigan |
| Mother's Birthplace | Michigan |
| Occupation | Stock Clerk |
| Industry | Moving Picture Ind |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Son, age 29
Cook-County, Illinois · implied b. ~1911 — 3 household members
| Surname | Grady |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 29 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | CHICAGO CITY |
| 1935 Residence (County) | COOK |
| Occupation | Radiator Assembler |
| Industry | Radiator and Tractor Works |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1100 |
| Highest Grade | H 8 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
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 James Grady (~0.92 confidence) and father James Grady (~0.92 confidence) and mother Melvina Grady (~0.92 confidence) and mother Alvina Grady (~0.92 confidence) and mother Angeline Grady (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
James Grady
b. ~1877
Source father
● Household
· direct · ~0.92
Father
James Grady
b. ~1878
Source father
● Household
· direct · ~0.92
Mother
Melvina Grady
b. ~1878
Source mother
● Household
· direct · ~0.92
Mother
Alvina Grady
b. ~1880
Source mother
● Household
· direct · ~0.92
Mother
Angeline Grady
b. ~1880
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Grady
Son · 1940 · age 29 · b. ~1911 · Illinois
★ You are viewing this record
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Cook-County, Illinois
Open full size
1940 US Federal Census — Cook-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00987-00544)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Emma Stackley | 65 | Wife | — | Germany |
| 42 | Melvina Grady | 62 | Head | — | Michigan |
| 43 | John Grady THIS PERSON | 29 | Son | Radiator Assembler | Illinois |
| 44 | Russell Edgar Grady | 63 | Lodger | Clerk | Illinois |
| 45 | Catherine Hester | 62 | Head | Art Works | England |
| 46 | Catherine Hester | 25 | Daughter | Music Teacher | Illinois |
| 47 | Martin Mcdonnell | 33 | Son-in-law | Driver Salesman | Illinois |
| 48 | Marion Mcdonnell | 35 | Daughter | — | Illinois |
| 49 | Donald Mcdonnell | 9 | Son | — | Illinois |
| 50 | James Mcdonnell | 7 | Son | — | Illinois |
| 51 | Edward Frey | 60 | Head | — | Poland |
| 52 | Mathilda Frey | 56 | Wife | — | Poland |
| 53 | Mathilde Frey | 22 | Daughter | Candy Maker | Illinois |
| 54 | Albert Frey | 20 | Son | Packer | Illinois |
| 55 | Clara Frey | 18 | Daughter | Housework | Illinois |
| 56 | Emil Frey | 15 | Son | — | Illinois |
| 57 | Ida Carlander | 82 | Head | — | Sweden |
| 58 | Arnot Christiansen | 50 | Son-in-law | Shipping Clerk | Norway |
| 59 | Henry Mueller | 52 | Head | Clerk | Illinois |
| 60 | Alma D Mueller | 46 | Wife | — | Illinois |
| 61 | Emil Mueller | 26 | Son | — | Illinois |
| 62 | Howard Mueller | 19 | Son | Office Boy | Illinois |
| 63 | Paul Machtlowicz | 61 | Head | Barber | Poland |
| 64 | Agnes Machtlowicz | 61 | Wife | — | Poland |
| 65 | William Ballwanz | 45 | Head | Carpenter | Illinois |
| 66 | Hazel Ballwanz | 33 | Wife | — | Illinois |
| 67 | Helene Menten | 44 | Head | File Clerk | Illinois |
| 68 | Jennie Menten | 80 | Mother-in-law | — | Iowa |
| 69 | Earl T Menten | 18 | Son | — | Illinois |
| 70 | Gertrude Reddi | 54 | Aunt | — | Iowa |
| 71 | Joseph Mushell | 82 | Head | — | Poland |
| 72 | Antoinette Mushell | 75 | Wife | — | Poland |
| 73 | Frank Mushell | 55 | Son | Laborer | Illinois |
| 74 | Paul Mushell | 46 | Son | Runner | Illinois |
| 75 | Lucy Maday | 47 | Daughter | Making Heating Pads | Illinois |
| 76 | Agnes Mueller | 41 | Daughter | — | Illinois |
| 77 | William Mueller | 11 | Grandson | — | Illinois |
| 78 | Martha Wicherslage | 65 | Head | — | Illinois |
| 79 | Raymond Hansen | 44 | Son | Millwright | Illinois |
| 80 | Jennie Hansen | 51 | Daughter-in-law | — | Illinois |
Pedigree Summary
John
Gen 1 · 5 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)