GC
Grace Cook — 1940 US Census Record
Model Tree available1940 United States Federal Census · Suffolk-County, Massachusetts
Our Model Tree links this Grace Cook across the 1920, 1930 and 1940 US Censuses in Suffolk-County, Massachusetts (XGBoost, ~Confirmed), with identified parents Clara — first a daughter (b.~1869), then head of a 4-person household.
Age 71
b. ~1869
Female
Daughter
Born: Massachusetts
Widowed
1940 Census Record Details
| Census Year | 1940 |
| Location | Suffolk-County, Massachusetts |
| Surname | Cook |
| Given Name | Grace T |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 71 |
| Marital Status | Widowed |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Chelsea City |
| 1935 Residence (County) | Suffolk |
| Additional Details | |
| Class of Worker | 0 |
| Highest Grade | H-4 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Chelsea City |
| Est. Birth Year | ~1869 |
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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Grace | Age | Birth yr |
|---|---|---|---|---|
| Grace Cook | Daughter | — | 71 | ~1869 |
| Clara Harlow | Head | — | 40 | ~1900 |
| Helen Harlow | Daughter | — | 61 | ~1879 |
| Clara Harlow | Daughter | — | 54 | ~1886 |
Census Appearances
1920
Suffolk, Massachusetts
Spouse, age 50
Suffolk, Massachusetts · implied b. ~1870 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cook |
| Given Name | Grace I |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 50 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Suffolk, Massachusetts
Other, age 61
Suffolk, Massachusetts · implied b. ~1869 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cook |
| Given Name | Grace T |
| Relationship to Head | Wife-H |
| Sex | F |
| Color / Race | White |
| Age | 61 |
| Marital Status | Married |
| Birthplace | Massachusetts |
| Age at First Marriage | 21 |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Suffolk-County, Massachusetts
Daughter, age 71
Suffolk-County, Massachusetts · implied b. ~1869 — 4 household members
| Surname | Cook |
| Given Name | Grace T |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 71 |
| Marital Status | Widowed |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Chelsea City |
| 1935 Residence (County) | Suffolk |
| Class of Worker | 0 |
| Highest Grade | H-4 |
| 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 Grace Cook across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: mother Clara Harlow (~0.50 confidence). The pedigree spans 1 generation with 1 identified ancestor.
Show:
Gen 1
Parents
confidence ≈ 0.5
Mother
Clara Harlow
b. ~1900
Source mother
● Household
· direct · ~0.5
This person
Anchor record
Grace Cook
Daughter · 1940 · age 71 · b. ~1869 · Massachusetts
★ You are viewing this record
Sibling
Helen Harlow
Sibling · 1940 · age 61
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Clara Harlow
Sibling · 1940 · age 54
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 — Suffolk-County, Massachusetts
Open full size
1940 US Federal Census — Suffolk-County, Massachusetts
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01642-00380)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Grace M Cotter | 3 | Daughter | — | Massachusetts |
| 2 | Helen C Cotter | 6 | Daughter | — | Massachusetts |
| 3 | Raymond Wilkinson | 26 | Head | Pipe Coverer | Massachusetts |
| 4 | Frances M Wilkinson | 27 | Wife | — | Massachusetts |
| 5 | Jacob Shore | 32 | Head | Proprietor | Russia |
| 6 | Freda B Shore | 29 | Wife | — | Massachusetts |
| 7 | Anna Pearlman | 51 | Mother-in-law | — | Latvia |
| 8 | Morris Morris | 25 | Brother-in-law | Shipper | Massachusetts |
| 9 | William Wolper | 35 | Head | Manager | Russia |
| 10 | Martha Wolper | 33 | Wife | — | New Hampshire |
| 11 | Helene Wolper | 8 | Daughter | — | Massachusetts |
| 12 | Gerald Wolper | 3 | Son | — | Massachusetts |
| 13 | Clara M Harlow | 40 | Head | — | Massachusetts |
| 14 | Helen F Harlow | 61 | Daughter | — | Massachusetts |
| 15 | Clara L Harlow | 54 | Daughter | Stenographer | Massachusetts |
| 16 | Grace T Cook THIS PERSON | 71 | Daughter | — | Massachusetts |
| 17 | Frederick W Slade | 51 | Head | Attendant | Massachusetts |
| 18 | Ellen T Slade | 57 | Wife | Chief Clerk | Massachusetts |
| 19 | Marguerite E Nugent | 34 | Roomer | Teacher | Massachusetts |
| 20 | Esther Swonstrom | 40 | Roomer | Teacher | Massachusetts |
| 21 | William Pillsbury | 55 | Roomer | — | Maine |
| 22 | William Rosen | 45 | Head | Plumber | Massachusetts |
| 23 | Evelyn E Rosen | 39 | Wife | — | Russia |
| 24 | Martin Rosen | 21 | Son | Plumber | Massachusetts |
| 25 | Jean E Rosen | 22 | Daughter-in-law | — | Massachusetts |
| 26 | Arline R Rosen | 17 | Daughter | — | Massachusetts |
| 27 | Mary L Morris | 42 | Head | Mounting Art Pictures | Massachusetts |
| 28 | John S Morris | 12 | Son | — | Massachusetts |
| 29 | Mary F Morris | 12 | Daughter | — | Massachusetts |
| 30 | Barney Nager | 28 | Head | Painter | Massachusetts |
| 31 | Sally Nager | 25 | Wife | — | Russia |
| 32 | Deanne Nager | 2 | Daughter | — | Massachusetts |
| 33 | Annie G Sharkey | 63 | Head | — | Massachusetts |
| 34 | Edwin J Riley | 33 | Head | Pressman | Maine |
| 35 | Evelyn J Riley | 34 | Wife | — | Massachusetts |
| 36 | Edwin J Jr Riley | 8 | Son | — | Massachusetts |
| 37 | Grace M Riley | 3 | Daughter | — | Massachusetts |
| 38 | Mary Hearn | 49 | Roomer | Time Keeper | Massachusetts |
| 39 | Mary E Carey | 57 | Head | — | Massachusetts |
| 40 | Alice E Carey | 34 | Daughter | Finishing Dept | Massachusetts |
Pedigree Summary
Grace + 2 siblings
Gen 1 · 1 parents
~0.5
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)