RD
Robert Douglas — 1940 US Census Record
Model Tree available1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this Robert Douglas across the 1920, 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed), with identified parents Walter & Mary — first a son (b.~1915), then head of a 9-person household.
Age 25
b. ~1915
Male
Son
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Douglas |
| Given Name | Robert A. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Somerville City |
| 1935 Residence (County) | Middlesex |
| Additional Details | |
| Highest Grade | C-5 |
| 1935 Residence | Same place |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Township / Ward | Somerville City |
| Est. Birth Year | ~1915 |
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.
9 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Robert | Age | Birth yr |
|---|---|---|---|---|
| Murray Douglas | Son | — | 18 | ~1922 |
| Mary Douglas | Daughter | — | 17 | ~1923 |
| Paul Douglas | Son | — | 10 | ~1930 |
| Abigail Douglas | Other | — | 58 | ~1882 |
| Anna Roy | Other | — | 28 | ~1912 |
| Walter Douglas | Head | — | 50 | ~1890 |
| Walter Douglas | Son | — | 24 | ~1916 |
| Robert Douglas | Son | — | 25 | ~1915 |
| Mary Douglas | Spouse | — | 50 | ~1890 |
Census Appearances
1920
Middlesex, Massachusetts
Son, age 5
Middlesex, Massachusetts · implied b. ~1915 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Douglas |
| Given Name | Robert E |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 5 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1930
Middlesex, Massachusetts
Son, age 15
Middlesex, Massachusetts · implied b. ~1915 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Douglas |
| Given Name | Robert E. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Can Read/Write | Yes |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
1940
Middlesex-County, Massachusetts
Son, age 25
Middlesex-County, Massachusetts · implied b. ~1915 — 9 household members
| Surname | Douglas |
| Given Name | Robert A. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Somerville City |
| 1935 Residence (County) | Middlesex |
| Highest Grade | C-5 |
| 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 Robert Douglas across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Walter Douglas (~0.92 confidence) and mother Mary Douglas (~0.92 confidence) and mother Mary Douglas (~0.92 confidence) and mother Mary Douglas (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Walter Douglas
b. ~1890
Source father
● Household
· direct · ~0.92
Mother
Mary Douglas
b. ~1890
Source mother
● Household
· direct · ~0.92
Mother
Mary Douglas
b. ~1890
Source mother
● Household
· direct · ~0.92
Mother
Mary Douglas
b. ~1892
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Robert Douglas
Son · 1940 · age 25 · b. ~1915 · Massachusetts
★ You are viewing this record
Sibling
Walter Douglas
Sibling · 1940 · age 24
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Paul Douglas
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Murray Douglas
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Douglas
Sibling · 1940 · age 17
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-t0627-01704-00369)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | David Ward | 8 | Son | — | Massachusetts |
| 42 | Arthur Cabagano | 31 | Head | Dental Technician | Massachusetts |
| 43 | Clare Cabagano | 27 | Wife | Typist | Massachusetts |
| 44 | Thomas S. Worley | 57 | Head | Master | England |
| 45 | Sarah G. Worley | 53 | Wife | — | Newfoundland |
| 46 | Isabel E. Worley | 23 | Daughter | — | Newfoundland |
| 47 | Walter L. Sr. Douglas | 50 | Head | Druggist | Massachusetts |
| 48 | Mary C. Douglas | 50 | Wife | — | Massachusetts |
| 49 | Robert A. Douglas THIS PERSON | 25 | Son | — | Massachusetts |
| 50 | Walter J. Douglas | 24 | Son | Assistant Manager | Massachusetts |
| 51 | Murray Douglas | 18 | Son | Clerk | Massachusetts |
| 52 | Mary Douglas | 17 | Daughter | — | Massachusetts |
| 53 | Paul Douglas | 10 | Son | — | Massachusetts |
| 54 | Abigail Douglas | 58 | Sister | Makes Blankets | Massachusetts |
| 55 | Anna Roy | 28 | Lodger | Housekeeper | Massachusetts |
| 56 | Augustus Durante | 30 | Head | Salesman | Massachusetts |
| 57 | Sarah Durante | 30 | Wife | Trained Nurse | Massachusetts |
| 58 | Mark Durante | 3 | Son | — | Massachusetts |
| 59 | William F. Swift | 33 | Head | Margin Clerk | Massachusetts |
| 60 | Eva Swift | 32 | Wife | — | Massachusetts |
| 61 | Marilyn Swift | 1 | Daughter | — | Massachusetts |
| 62 | George F. Rose | 46 | Head | Manager | Massachusetts |
| 63 | Agnes M. Rose | 45 | Wife | — | Nova Scotia |
| 64 | Charles Rose | 4 | Son | — | Massachusetts |
| 65 | John A. Gannon | 18 | Nephew | — | Nova Scotia |
| 66 | Walter J. Chapman | 62 | Head | Language Teacher | Massachusetts |
| 67 | Jeanette B. Chapman | 63 | Wife | — | Massachusetts |
| 68 | John H. Pierce | 28 | Son-in-law | — | Maine |
| 69 | Martha C. Pierce | 27 | Daughter | Secretary | Massachusetts |
| 70 | Patrick J. Goley | 59 | Head | Janitor | Northern Ireland |
| 71 | Mary E. Goley | 61 | Wife | — | English Canada |
| 72 | Russell G. Smith | 23 | Step-son | Spare Man | Massachusetts |
| 73 | Eugenia E. Smith | 19 | Daughter-in-law | — | Massachusetts |
| 74 | George (X) Aldred | 34 | Head | Spray Painter | English Canada |
| 75 | Dora Aldred | 35 | Wife | — | Massachusetts |
| 76 | Barbara Aldred | 13 | Daughter | — | Massachusetts |
| 77 | George Aldred | 8 | Son | — | Massachusetts |
| 78 | Robert Aldred | 3 | Son | — | Massachusetts |
| 79 | Dorothy Aldred | 1 | Daughter | — | Massachusetts |
| 80 | Jeremiah (X) Murphy | 37 | Head | Helper On Truck | England |
Pedigree Summary
Robert + 4 siblings
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)