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Robert Blair — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Lake-County, Indiana
Our Model Tree links this Robert Blair across the 1930 and 1940 US Censuses in Lake-County, Indiana (XGBoost, ~Confirmed) — first a son (b.~1929), then head of a 8-person household.
Age 11
b. ~1929
Male
Son
Born: Indiana
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Lake-County, Indiana |
| Surname | Blair |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Indiana |
| 1935 Residence (City) | Gary |
| 1935 Residence (County) | Lake |
| Additional Details | |
| Highest Grade | G-5 |
| 1935 Residence | Same place |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
| Township / Ward | Gary |
| Est. Birth Year | ~1929 |
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.
8 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Robert | Age | Birth yr |
|---|---|---|---|---|
| Dolly Blair | Daughter | — | 3 | ~1937 |
| Joyce Blair | Daughter | — | 1 | ~1939 |
| Robert Blair | Head | — | 37 | ~1903 |
| Ronald Blair | Son | — | 7 | ~1933 |
| Mary Blair | Spouse | — | 29 | ~1911 |
| Robert Blair | Son | — | 11 | ~1929 |
| James Blair | Son | — | 5 | ~1935 |
| Jean Blair | Daughter | — | 9 | ~1931 |
Census Appearances
1930
Lake, Indiana
Other, age 1
Lake, Indiana · implied b. ~1929 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Blair |
| Given Name | Robert |
| Relationship to Head | Roomer |
| Sex | M |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Indiana |
| Father's Birthplace | Indiana |
| Mother's Birthplace | Missouri |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
1940
Lake-County, Indiana
Son, age 11
Lake-County, Indiana · implied b. ~1929 — 8 household members
| Surname | Blair |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Indiana |
| 1935 Residence (City) | Gary |
| 1935 Residence (County) | Lake |
| Highest Grade | G-5 |
| 1935 Residence | Same place |
| Birth State | Indiana |
| Birth Country | United States |
| Birthplace (normalized) | indiana |
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 Robert Blair across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Robert Blair
Son · 1940 · age 11 · b. ~1929 · Indiana
★ You are viewing this record
Sibling
Joyce Blair
Sibling · 1940 · age 1
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ronald Blair
Sibling · 1940 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Blair
Sibling · 1940 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Dolly Blair
Sibling · 1940 · age 3
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Jean Blair
Sibling · 1940 · age 9
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 — Lake-County, Indiana
Open full size
1940 US Federal Census — Lake-County, Indiana
Page Contents
36 people indexed on this census page (nara:1940:m-t0627-01120-00086)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Robert Blair | 37 | Head | Assistant Engineer | Illinois |
| 42 | Mary Ann Blair | 29 | Wife | — | Missouri |
| 43 | Robert Blair THIS PERSON | 11 | Son | — | Indiana |
| 44 | Jean Blair | 9 | Daughter | — | Indiana |
| 45 | Ronald Blair | 7 | Son | — | Indiana |
| 46 | James Blair | 5 | Son | — | Indiana |
| 47 | Dolly Blair | 3 | Daughter | — | Indiana |
| 48 | Joyce Blair | 1 | Daughter | — | Indiana |
| 50 | William Ireland | 26 | Head | Craneman | Alabama |
| 51 | Ada Ireland | 22 | Wife | — | Indiana |
| 52 | William Ireland | 1 | Son | — | Indiana |
| 54 | Jack Slovinsky | 46 | Head | Steel Straightener | Pennsylvania |
| 55 | Frederick Slovinsky | 16 | Son | — | Indiana |
| 56 | Carl Marquette | 41 | Head | Office Clerk | Wisconsin |
| 57 | Vera Marquette | 29 | Wife | Waitress | Indiana |
| 59 | John Milligan | 59 | Head | Millwright | Scotland |
| 60 | Elizabeth Milligan | 53 | Wife | — | Scotland |
| 61 | Charles Milligan | 18 | Son | — | Indiana |
| 62 | Harland Milligan | 14 | Son | — | Indiana |
| 63 | Marguerite Milligan | 12 | Daughter | — | Indiana |
| 65 | Carl Soder | 49 | Head | Axle Turner | Illinois |
| 66 | Robert Soder | 20 | Son | Bookkeeper | Indiana |
| 67 | Arlene Soder | 17 | Daughter | — | Indiana |
| 68 | Bernice Soder | 13 | Daughter | — | Indiana |
| 69 | Louisa Soder | 77 | Mother | — | Sweden |
| 70 | George Benner | 49 | Head | Watchman | Indiana |
| 71 | Ida Benner | 47 | Wife | Attendant | Indiana |
| 72 | Betty-Jane Benner | 16 | Daughter | — | Indiana |
| 73 | Ella Gray | 74 | Mother-in-law | — | Indiana |
| 74 | Wendell Strabsky | 35 | Head | Insurance Salesman | Czechoslovakia |
| 75 | Joan Strabsky | 32 | Wife | — | Scotland |
| 76 | Wendell Strabsky | 8 | Son | — | Indiana |
| 77 | Ann Marguerite Strabsky | 3 | Daughter | — | Indiana |
| 78 | John Edward Strabsky | 0 | Son | — | Indiana |
| 79 | Jake Brialopski | 46 | Head | Car Builder | Pennsylvania |
| 80 | Anna Brialopski | 39 | Wife | — | Syria |
Related Census Records
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)