MG
Mary Grady — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this Mary Grady across the 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed) — first a daughter (b.~1928), then head of a 7-person household.
Age 12
b. ~1928
Female
Daughter
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Grady |
| Given Name | Mary |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Lowell City |
| 1935 Residence (County) | Middlesex |
| Additional Details | |
| Highest Grade | G 8 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Lowell City |
| Est. Birth Year | ~1928 |
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 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Frank Grady | Son | — | 4 | ~1936 |
| Rita Grady | Daughter | — | 7 | ~1933 |
| Helen Grady | Daughter | — | 11 | ~1929 |
| Anna Grady | Daughter | — | 14 | ~1926 |
| Anna Grady | Spouse | — | 32 | ~1908 |
| Mary Grady | Daughter | — | 12 | ~1928 |
| Stella Grady | Daughter | — | 2 | ~1938 |
Census Appearances
1930
Middlesex, Massachusetts
Daughter, age 1
Middlesex, Massachusetts · implied b. ~1929 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Grady |
| Given Name | Marjorie |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Daughter, age 12
Middlesex-County, Massachusetts · implied b. ~1928 — 7 household members
| Surname | Grady |
| Given Name | Mary |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Lowell City |
| 1935 Residence (County) | Middlesex |
| Highest Grade | G 8 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
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 · 1940 · age 12 · b. ~1928 · Massachusetts
★ You are viewing this record
Sibling
Helen Grady
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Rita Grady
Sibling · 1940 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Anna Grady
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Frank Grady
Sibling · 1940 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Stella Grady
Sibling · 1940 · age 2
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 — Middlesex-County, Massachusetts
Open full size
1940 US Federal Census — Middlesex-County, Massachusetts
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01694-00508)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Anna D. Grady | 32 | wife | — | Massachusetts |
| 42 | Anna Grady | 14 | daughter | — | Massachusetts |
| 43 | Mary Grady THIS PERSON | 12 | daughter | — | Massachusetts |
| 44 | Helen Grady | 11 | daughter | — | Massachusetts |
| 45 | Rita Grady | 7 | daughter | — | Massachusetts |
| 46 | Frank Grady | 4 | son | — | Massachusetts |
| 47 | Stella Grady | 2 | daughter | — | Massachusetts |
| 48 | Frank Mastenon|Masterson | 43 | head | Foreman | Massachusetts |
| 49 | Laura B. Mastenon|Masterson | 38 | wife | — | Massachusetts |
| 50 | Francis Mastenon|Masterson | 15 | son | — | Massachusetts |
| 51 | Pauline Mastenon|Masterson | 13 | daughter | — | Massachusetts |
| 52 | Mary Mastenon|Masterson | 12 | daughter | — | Massachusetts |
| 53 | Phyllis Mastenon|Masterson | 11 | daughter | — | Massachusetts |
| 54 | Thomas Kelley | 52 | head | Boiler Maker | Massachusetts |
| 55 | Mary D. Kelley | 51 | wife | — | Massachusetts |
| 56 | John Kelley | 20 | son | Leg Shaper | Massachusetts |
| 57 | Mary Kelley | 18 | daughter | — | Massachusetts |
| 58 | Margaret Kelley | 17 | daughter | — | Massachusetts |
| 59 | Thomas D. Cumming | 76 | head | — | England |
| 60 | Annie Cumming | 76 | wife | — | Massachusetts |
| 61 | Esther M. Manning | 45 | head | — | Massachusetts |
| 62 | Elrene Manning | 22 | daughter | Clerk | Massachusetts |
| 63 | John F. Gair | 53 | head | Compositor | Massachusetts |
| 64 | Jessie Gair | 47 | wife | — | New Hampshire |
| 65 | D. Robert Gair | 21 | son | Plate Maker | Massachusetts |
| 66 | Donald M. Gair | 19 | son | — | Massachusetts |
| 67 | William D. Gair | 17 | son | Helper Of Pressman | Massachusetts |
| 68 | Richard D. Gair | 15 | son | — | Massachusetts |
| 69 | James P. Murphy | 39 | head | Accountant | Massachusetts |
| 70 | Gertrude Murphy | 38 | wife | — | Massachusetts |
| 71 | James Jr. Murphy | 7 | son | — | Massachusetts |
| 72 | Marcelle Murphy | 6 | daughter | — | Massachusetts |
| 73 | Jo Ann Murphy | 4 | daughter | — | Massachusetts |
| 74 | William J. Burke | 34 | br-in-law | Recreational Instructor | Massachusetts |
| 75 | Daniel Burke | 24 | br-in-law | Capacitor | Massachusetts |
| 76 | Edward Blain | 42 | head | Leather Worker | Canada-French |
| 77 | Christina Blain | 38 | wife | — | Massachusetts |
| 78 | Edward Blain | 15 | son | — | Massachusetts |
| 79 | Beverly Blain | 7 | daughter | — | Massachusetts |
| 80 | Robert Blain | 1 | son | — | Massachusetts |
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)