JG
John Grady — 1940 US Census Record
Model Tree available1940 United States Federal Census · Mason-County, Michigan
Our Model Tree links this John Grady across the 1920, 1930 and 1940 US Censuses in Mason-County, Michigan (XGBoost, ~Confirmed), with identified parents Henry & Humphrey — first a head (b.~1899), then head of a 3-person household.
Age 41
b. ~1899
Male
Head
Born: Michigan
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Mason-County, Michigan |
| Surname | Grady |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 41 |
| Marital Status | Single |
| Birthplace | Michigan |
| 1935 Residence (City) | Ludington city |
| 1935 Residence (County) | Mason |
| Additional Details | |
| Occupation | Manager |
| Industry | Automobile agency |
| Class of Worker | PW |
| Hours Worked | 60 |
| Income (1939) | 1560 |
| Highest Grade | H 8 |
| 1935 Residence | Same place |
| Birth State | Michigan |
| Birth Country | United States |
| Birthplace (normalized) | michigan |
| Occupation | Manager |
| Township / Ward | Ludington City |
| Est. Birth Year | ~1899 |
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 |
|---|---|---|---|---|
| Sue Grady | Other | — | 28 | ~1912 |
| Robert Grady | Son | — | 5 | ~1935 |
| John Grady | Head | — | 41 | ~1899 |
Census Appearances
1920
Mason, Michigan
Son, age 21
Mason, Michigan · implied b. ~1899 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Grady |
| Given Name | John |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Married |
| Birthplace | Michigan |
| Father's Birthplace | Michigan |
| Mother's Birthplace | Michigan |
| Occupation | Laborer |
| Industry | Car shop |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Michigan |
| Birth Country | United States |
| Birthplace (normalized) | michigan |
1930
Mason, Michigan
Son, age 31
Mason, Michigan · implied b. ~1899 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Grady |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 31 |
| Marital Status | Married |
| Birthplace | Michigan |
| Age at First Marriage | 20 |
| Father's Birthplace | Michigan |
| Mother's Birthplace | Michigan |
| Occupation | none |
| Can Read/Write | Yes |
| Veteran | No |
| Birth State | Michigan |
| Birth Country | United States |
| Birthplace (normalized) | michigan |
1940
Mason-County, Michigan
Head, age 41
Mason-County, Michigan · implied b. ~1899 — 3 household members
| Surname | Grady |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 41 |
| Marital Status | Single |
| Birthplace | Michigan |
| 1935 Residence (City) | Ludington city |
| 1935 Residence (County) | Mason |
| Occupation | Manager |
| Industry | Automobile agency |
| Class of Worker | PW |
| Hours Worked | 60 |
| Income (1939) | 1560 |
| Highest Grade | H 8 |
| 1935 Residence | Same place |
| Birth State | Michigan |
| Birth Country | United States |
| Birthplace (normalized) | michigan |
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 Henry Grady (~0.92 confidence) and father Humphrey Grady (~0.92 confidence) and mother Bertha Grady (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Henry Grady
b. ~1876
Source father
● Household
· direct · ~0.92
Father
Humphrey Grady
b. ~1876
Source father
● Household
· direct · ~0.92
Mother
Bertha Grady
b. ~1880
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Grady
Head · 1940 · age 41 · b. ~1899 · Michigan
★ 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 — Mason-County, Michigan
Open full size
1940 US Federal Census — Mason-County, Michigan
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01788-00192)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Mamie Kleiner | 45 | Niece | — | Michigan |
| 2 | Stanley Corbett | 31 | Head | Oiler | Pennsylvania |
| 3 | Irene Corbett | 29 | Wife | — | Michigan |
| 4 | Marlene Corbett | 3 | Daughter | — | Wisconsin |
| 5 | Jean Corbett | 3 | Daughter | — | Michigan |
| 6 | Victoria Corbett | 2 | Daughter | — | Michigan |
| 7 | Irene Corbett | 0 | Daughter | — | Michigan |
| 8 | Otis Nephew | 25 | Head | Laborer | Michigan |
| 9 | Marion Nephew | 17 | Wife | — | Michigan |
| 10 | Emma Thompson | 74 | Head | — | Sweden |
| 11 | Leander Pratt | 71 | Head | — | Ohio |
| 12 | Mary Pratt | 66 | Wife | — | Canada English |
| 13 | Franky Pratt | 41 | Son | Laborer | Michigan |
| 14 | Gerald Pratt | 40 | Nephew | Fisherman | Michigan |
| 15 | Frank Tappenburg | 60 | Head | Proprietor | Michigan |
| 16 | Sophia Tappenburg | 60 | Wife | Proprietor | Michigan |
| 17 | Martin Larson | 70 | Head | — | Denmark |
| 18 | Anna Larson | 68 | Wife | — | Michigan |
| 19 | Burley Query | 63 | Head | Painter | Canada English |
| 20 | Anna Query | 62 | Wife | — | Michigan |
| 21 | Howard Query | 38 | Son | Carpenter | Michigan |
| 22 | Clarence Swanberg | 30 | Head | Proprietor | Washington |
| 23 | Doris Swanberg | 24 | Wife | — | Michigan |
| 24 | Patricia Swanberg | 4 | Daughter | — | Michigan |
| 25 | Andrew Vogel | 65 | Head | Caretaker | Michigan |
| 26 | Emma Vogel | 60 | Wife | — | Michigan |
| 27 | John Grady THIS PERSON | 41 | Head | Manager | Michigan |
| 28 | Sue E. Grady | 28 | Sister | — | Michigan |
| 29 | Robert Grady | 5 | Son | — | Michigan |
| 30 | William Mclaw | 42 | Head | Captain | Pennsylvania |
| 31 | Dorothy Mclaw | 36 | Wife | — | Wisconsin |
| 32 | William Mclaw | 10 | Son | — | Wisconsin |
| 33 | Freeman Stearns | 36 | Head | Manufacturer | Michigan |
| 34 | Edith Stearns | 32 | Wife | — | Michigan |
| 35 | Laura Lee Stearns | 5 | Daughter | — | Michigan |
| 36 | Joan Stearns | 2 | Daughter | — | Michigan |
| 37 | Leroy Lindeman | 30 | Head | Laborer | Michigan |
| 38 | Harriet Lindeman | 29 | Wife | — | Michigan |
| 39 | Leroy Lindeman | 4 | Son | — | Michigan |
| 40 | Richard Lindeman | 2 | Son | — | Michigan |
Pedigree Summary
John
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)