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Mary Grady — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Cook, Illinois
Our Model Tree links this Mary Grady across the 1930 and 1940 US Censuses in Cook, Illinois (XGBoost, ~Confirmed) — first a daughter (b.~1919), then head of a 7-person household.
Age 11
b. ~1919
Female
Daughter
Born: Illinois
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Cook, Illinois |
| Surname | Grady |
| Given Name | Mary G |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Irish Free State |
| Mother's Birthplace | Irish Free State |
| Additional Details | |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1919 |
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.
7 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Michael Grady | Son | — | 9 | ~1921 |
| Mary Grady | Daughter | — | 11 | ~1919 |
| James Grady | Son | — | 13 | ~1917 |
| Frank Grady | Head | — | 39 | ~1891 |
| Mary Grady | Spouse | — | 38 | ~1892 |
| Francis Grady | Son | — | 14 | ~1916 |
| John Grady | Son | — | 4 | ~1926 |
Census Appearances
1930
Cook, Illinois
Daughter, age 11
Cook, Illinois · implied b. ~1919 — 7 household members
| Surname | Grady |
| Given Name | Mary G |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Irish Free State |
| Mother's Birthplace | Irish Free State |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Other, age 22
Cook-County, Illinois · implied b. ~1918 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Grady |
| Given Name | Mavis |
| Relationship to Head | Grand daughter |
| Sex | F |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Franklin Park village |
| 1935 Residence (County) | Cook |
| Occupation | teacher kindergarten |
| Industry | recreation |
| Class of Worker | GW |
| Hours Worked | 20 |
| Income (1939) | 765 |
| Highest Grade | H-4 |
| 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 Mary Grady across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Grady
Daughter · 1930 · age 11 · b. ~1919 · Illinois
★ You are viewing this record
Sibling
Francis Grady
Sibling · 1930 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Michael Grady
Sibling · 1930 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Grady
Sibling · 1930 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Grady
Sibling · 1930 · age 13
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
1930 US Federal Census — Cook, Illinois
Open full size
1930 US Federal Census — Cook, Illinois
Page Contents
50 people indexed on this census page (ia:1930:illinoiscensus00reel480:0814)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | John Ballner | 43 | Head | Machinist | Rumania |
| 52 | Elizabeth Ballner | 38 | Wife | — | Rumania |
| 53 | Hans Sommer | 29 | Head | Carpenter | Germany |
| 54 | Clair Sommer | 25 | Wife | — | Germany |
| 55 | Roy Sommer | 3 | Son | — | Illinois |
| 56 | Frank Grady | 39 | Head | Motorman | Irish Free State |
| 57 | Mary Grady | 38 | Wife | — | Irish Free State |
| 58 | Francis J Grady | 14 | Son | — | Illinois |
| 59 | James J Grady | 13 | Son | — | Illinois |
| 60 | Mary G Grady THIS PERSON | 11 | Daughter | — | Illinois |
| 61 | Michael E Grady | 9 | Son | — | Illinois |
| 62 | John T Grady | 4 | Son | — | Illinois |
| 63 | Royal Flesher | 23 | Head | Spray Painter | Michigan |
| 64 | Thelma Flesher | 23 | Wife | — | Michigan |
| 65 | Winifred Flesher | 6 | Step daughter | — | Michigan |
| 66 | Arlene Flesher | 1 | Daughter | — | Illinois |
| 67 | Harry Soughan | 42 | Head | Motorman | Illinois |
| 68 | Lilly Soughan | 37 | Wife | — | Illinois |
| 69 | Harry Jr Soughan | 14 | Son | — | Illinois |
| 70 | Robert C Soughan | 7 | Son | — | Illinois |
| 71 | Joseph H Taylor | 59 | Head | Sprinkler Fitter | Michigan |
| 72 | Emma Taylor | 56 | Wife | — | Wisconsin |
| 73 | George Rambert | 28 | Head | Electrician | Illinois |
| 74 | Neta Rambert | 26 | Wife | — | Illinois |
| 75 | George C Jr Rambert | 7 | Son | — | Illinois |
| 76 | Edward Rambert | 19 | Brother | Finisher | Illinois |
| 77 | George J Niclas | 39 | Head | Cable Splicer | Illinois |
| 78 | Gertrude Niclas | 34 | Wife | — | Illinois |
| 79 | Ruth P Niclas | 11 | Daughter | — | Illinois |
| 80 | Henry G Niclas | 9 | Son | — | Illinois |
| 81 | Albert Sheffman | 36 | Head | Storekeeping | Austria |
| 82 | Theresia Sheffman | 32 | Wife | — | Austria |
| 83 | Albert A Sheffman | 12 | Son | — | Illinois |
| 84 | Walter G Sheffman | 6 | Son | — | Illinois |
| 85 | Frank A Behrenst | 47 | Head | Foreman | Wisconsin |
| 86 | Marie Behrenst | 45 | Wife | — | Illinois |
| 87 | Franklin Behrenst | 19 | Son | — | Illinois |
| 88 | Ralph Behrenst | 15 | Son | — | Illinois |
| 89 | Virginia Behrenst | 12 | Daughter | — | Illinois |
| 90 | John Weir | 53 | Head | Bridge Tender | Scotland |
| 91 | Annie Weir | 50 | Wife | — | Scotland |
| 92 | Phyllis Weir | 23 | Daughter | Stenographer | Illinois |
| 93 | Hazel Weir | 18 | Daughter | — | Illinois |
| 94 | Donald Jackson | 14 | Nephew | — | Illinois |
| 95 | Jean Jackson | 12 | Niece | — | Illinois |
| 96 | Samuel V.A. White | 56 | Head | Policeman | New York |
| 97 | Ruth E White | 22 | Daughter | Statistician | New York |
| 98 | Charles Strauss | 30 | Head | Electrician | Germany |
| 99 | Caroline Strauss | 27 | Wife | — | Illinois |
| 100 | Caroline A Strauss | 8 | Daughter | — | Illinois |
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1930 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)