GM
Grace Martin — 1940 US Census Record
Model Tree available1940 United States Federal Census · Alameda-County, California
Our Model Tree links this Grace Martin across the 1920, 1930 and 1940 US Censuses in Alameda-County, California (XGBoost, ~Confirmed), with identified parents Duarte & De — first a spouse (b.~1916), then head of a 3-person household.
Age 24
b. ~1916
Female
Spouse
Born: California
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Alameda-County, California |
| Surname | Martin |
| Given Name | Grace |
| Relationship to Head | wife |
| Sex | F |
| Color / Race | White |
| Age | 24 |
| Marital Status | Married |
| Birthplace | California |
| 1935 Residence (City) | Oakland City |
| 1935 Residence (County) | Alameda |
| Additional Details | |
| Highest Grade | Hs 4 |
| 1935 Residence | Same Place |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
| Township / Ward | Oakland City |
| Est. Birth Year | ~1916 |
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 Grace | Age | Birth yr |
|---|---|---|---|---|
| Grace Martin | Spouse | — | 24 | ~1916 |
| Ernest Martin | Head | — | 28 | ~1912 |
| Arline Martin | Daughter | — | 2 | ~1938 |
Census Appearances
1920
Alameda, California
Daughter, age 3
Alameda, California · implied b. ~1917 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Martin |
| Given Name | Grace M. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 3 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | Azores |
| Mother's Birthplace | California |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1930
Alameda, California
Daughter, age 13
Alameda, California · implied b. ~1917 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Martin |
| Given Name | Grace |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | Portugal |
| Mother's Birthplace | California |
| Can Read/Write | Yes |
| Veteran | No |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1940
Alameda-County, California
Spouse, age 24
Alameda-County, California · implied b. ~1916 — 3 household members
| Surname | Martin |
| Given Name | Grace |
| Relationship to Head | wife |
| Sex | F |
| Color / Race | White |
| Age | 24 |
| Marital Status | Married |
| Birthplace | California |
| 1935 Residence (City) | Oakland City |
| 1935 Residence (County) | Alameda |
| Highest Grade | Hs 4 |
| 1935 Residence | Same Place |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
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 Martin across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Duarte Martin (~0.92 confidence) and father De Martin (~0.92 confidence) and mother Eugenia Martin (~0.92 confidence) and mother Eugenia Martin (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Duarte Martin
b. ~1884
Source father
● Household
· direct · ~0.92
Father
De Martin
b. ~1885
Source father
● Household
· direct · ~0.92
Mother
Eugenia Martin
b. ~1891
Source mother
● Household
· direct · ~0.92
Mother
Eugenia Martin
b. ~1893
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Grace Martin
Spouse · 1940 · age 24 · b. ~1916 · California
★ 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 — Alameda-County, California
Open full size
1940 US Federal Census — Alameda-County, California
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00434-00651)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Mabel Smith | 22 | wife | — | California |
| 2 | Lewis Smith | 21 | Brother | Deputy Sheriff | Utah |
| 3 | Arthur P. Tavares | 32 | Head | Packing Machine | Portugal |
| 4 | Mary Tavares | 31 | wife | — | Hawaii |
| 5 | Arthur Jr. Tavares | 13 | son | — | California |
| 6 | Hazel Rose Tavares | 12 | daughter | — | California |
| 7 | Mary Jane Tavares | 2 | daughter | — | California |
| 8 | Tony Q. Ramos | 21 | Head | Pullman | California |
| 9 | Margaret Ramos | 18 | wife | — | Hawaii |
| 10 | John Ramos | 0 | son | — | California |
| 11 | Joseph Ferreira | 55 | Head | Labour | Portugal |
| 12 | Rosa Q. Ferreira | 47 | wife | — | California |
| 13 | Annabel Ferreira | 13 | daughter | — | California |
| 14 | Manuel Perry | 42 | Head | Carpenter | Hawaii |
| 15 | Virginia Perry | 39 | wife | Marker | Portugal |
| 16 | Derby Perry | 19 | son | Hardware Salesman | California |
| 17 | Vernon Perry | 17 | son | — | California |
| 18 | Minnie Barrett | 61 | Mother-in-law | — | Portugal |
| 19 | Ernest Q. Martin | 28 | Head | Pullman | Hawaii |
| 20 | Grace Martin THIS PERSON | 24 | wife | — | California |
| 21 | Arline Martin | 2 | daughter | — | California |
| 22 | John W. Martin | 64 | Head | — | Portugal |
| 23 | Marie Q. Martin | 54 | wife | — | Portugal |
| 24 | John Jr. Martin | 34 | son | Laborer | California |
| 25 | Mabel Martin | 23 | daughter | — | Hawaii |
| 26 | Melvin Martin | 11 | son | — | California |
| 27 | Jesse Q. Souza | 30 | Head | Laborer | Hawaii |
| 28 | Julia Souza | 20 | wife | — | Hawaii |
| 29 | Joseph Alves | 19 | brother-in-law | Janitor | Hawaii |
| 30 | Isabel Almeida | 75 | Head | — | Portugal |
| 31 | Virginia Almeida | 39 | daughter | Laundress | California |
| 32 | Tony Jr. Alves | 28 | Head | Salesman | Hawaii |
| 33 | Angie Q. Alves | 32 | wife | — | Hawaii |
| 34 | Marvin Alves | 4 | son | — | California |
| 35 | Alfred N. Q. Martin | 38 | Head | Porter | Hawaii |
| 36 | Eva Martin | 27 | wife | — | Hawaii |
| 37 | Frank Souza | 26 | brother-in-law | Delivery Man | Hawaii |
| 38 | George Jr. Martin | 24 | Head | Laborer | Hawaii |
| 39 | Delores Q. Martin | 23 | wife | — | California |
| 40 | George Jr. Martin | 4 | son | — | California |
Pedigree Summary
Grace
Gen 1 · 4 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)