RL
Robert Lambert — 1940 US Census Record
Model Tree available1940 United States Federal Census · Middlesex-County, Massachusetts
Our Model Tree links this Robert Lambert across the 1920, 1930 and 1940 US Censuses in Middlesex-County, Massachusetts (XGBoost, ~Confirmed), with identified parents Frederick & Frederick — first a son (b.~1918), then head of a 4-person household.
Age 22
b. ~1918
Male
Son
Born: Massachusetts
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Middlesex-County, Massachusetts |
| Surname | Lambert |
| Given Name | Robert W. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Tyngsborough |
| 1935 Residence (County) | Middlesex |
| Additional Details | |
| Occupation | Production clerk |
| Industry | Copper & Brass |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 266 |
| Highest Grade | C-4 |
| 1935 Residence | Same house |
| Birth State | Massachusetts |
| Birth Country | United States |
| Birthplace (normalized) | massachusetts |
| Occupation | Production Clerk |
| Township / Ward | Tyngsborough |
| Est. Birth Year | ~1918 |
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 Robert | Age | Birth yr |
|---|---|---|---|---|
| David Lambert | Son | — | 27 | ~1913 |
| Robert Lambert | Son | — | 22 | ~1918 |
| Frederick Lambert | Head | — | 62 | ~1878 |
| Catherine Lambert | Spouse | — | 56 | ~1884 |
Census Appearances
1920
Middlesex, Massachusetts
Son, age 2
Middlesex, Massachusetts · implied b. ~1918 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Lambert |
| Given Name | Robert D. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 2 |
| 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 12
Middlesex, Massachusetts · implied b. ~1918 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Lambert |
| Given Name | Robert D. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| 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 22
Middlesex-County, Massachusetts · implied b. ~1918 — 4 household members
| Surname | Lambert |
| Given Name | Robert W. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Massachusetts |
| 1935 Residence (City) | Tyngsborough |
| 1935 Residence (County) | Middlesex |
| Occupation | Production clerk |
| Industry | Copper & Brass |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 266 |
| Highest Grade | C-4 |
| 1935 Residence | Same house |
| 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 Lambert across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Frederick Lambert (~0.92 confidence) and father Frederick Lambert (~0.92 confidence) and mother Catherine Lambert (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Frederick Lambert
b. ~1878
Source father
● Household
· direct · ~0.92
Father
Frederick Lambert
b. ~1867
Source father
● Household
· direct · ~0.92
Mother
Catherine Lambert
b. ~1884
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Robert Lambert
Son · 1940 · age 22 · b. ~1918 · Massachusetts
★ You are viewing this record
Sibling
David Lambert
Sibling · 1940 · age 27
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-t0627-01618-00262)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Ethel M. Sargent | 65 | Head | Manager | Massachusetts |
| 2 | Juanita L. Sargent | 14 | Granddaughter | — | Massachusetts |
| 3 | Koharles Der-Kasian | 35 | Hired man | — | Armenia |
| 4 | Mary K. Trudel | 49 | Roomer | Nurse | Massachusetts |
| 5 | Lumber Kenney | 23 | Roomer | Lawyer | Massachusetts |
| 6 | Elizabeth Mihant | 65 | Roomer | — | Ireland |
| 7 | Vera Blay | 54 | Head | Practical Nurse | Vermont |
| 8 | Helen Blay | 16 | Daughter | — | Massachusetts |
| 9 | Raymond W. Sherburne | 54 | Head | Lawyer | Massachusetts |
| 10 | Lilla A. Sherburne | 54 | Wife | — | Massachusetts |
| 11 | Russell K. Sherburne | 18 | Son | — | Massachusetts |
| 12 | Esther Sherburne | 16 | Daughter | — | Massachusetts |
| 13 | Marian Sherburne | 13 | Daughter | — | Massachusetts |
| 14 | John S. Riley | 22 | Son-in-law | Bus Driver | Massachusetts |
| 15 | Eleanor S. Riley | 22 | Daughter | — | Massachusetts |
| 16 | Charles H. Riley | 0 | Grandson | — | Massachusetts |
| 17 | Frederick W. Lambert | 62 | Head | Physician | Massachusetts |
| 18 | Catherine Lambert | 56 | Wife | — | Massachusetts |
| 19 | David Lambert | 27 | Son | Officer | Massachusetts |
| 20 | Robert W. Lambert THIS PERSON | 22 | Son | Production Clerk | Massachusetts |
| 21 | Nora M. Bohonnon | 65 | Head | Proprietress | Vermont |
| 22 | Charles Shaw | 60 | Brother | — | Vermont |
| 23 | George Shaw | 71 | Brother | — | Vermont |
| 24 | Leon W. Barr | 55 | Hired man | Hired Man | Connecticut |
| 25 | Howard Webster | 66 | Head | Farm Hand | Maine |
| 26 | Beatrice Webster | 63 | Wife | — | Massachusetts |
| 27 | Morton M. Wright | 38 | Head | Proprietor | Massachusetts |
| 28 | Florence E. Merrill | 72 | Head | — | Canada English |
| 29 | Sumner Clifford | 79 | Brother | — | Canada English |
| 30 | Walter G. Hitchins | 38 | Head | Musician | Massachusetts |
| 31 | Mildred W. Hitchins | 38 | Wife | — | Massachusetts |
| 32 | Lewis G. Hitchins | 5 | Son | — | Massachusetts |
| 33 | Eunice F. Hitchins | 2 | Daughter | — | Massachusetts |
| 34 | Charles M. Dunning | 50 | Head | Chairman | Massachusetts |
| 35 | Raymond K. Dunning | 15 | Son | — | Massachusetts |
| 36 | Jane Moffatt | 72 | Head | — | Ireland |
| 37 | Charles J. Allgrove | 54 | Head | Highway Surveyor | England |
| 38 | Tyra M. Allgrove | 50 | Wife | — | Sweden |
| 39 | Virginia Allgrove | 25 | Daughter | Teacher | Massachusetts |
| 40 | Josephine Allgrove | 23 | Daughter | Private Secretary | Massachusetts |
Pedigree Summary
Robert + 1 sibling
Gen 1 · 3 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)