JC
John Cahill — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Norfolk-County, Massachusetts
Our Model Tree links this John Cahill across the 1930 and 1940 US Censuses in Norfolk-County, Massachusetts (XGBoost, ~Confirmed) — first a son (b.~1925), then head of a 9-person household.
Age 15
b. ~1925
Male
Son
Born: Florida
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Norfolk-County, Massachusetts |
| Surname | Cahill |
| Given Name | John H. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Florida |
| 1935 Residence (City) | Braintree |
| 1935 Residence (County) | Norfolk |
| Additional Details | |
| Highest Grade | Hs 1 |
| 1935 Residence | Same place |
| Birth State | Florida |
| Birth Country | United States |
| Birthplace (normalized) | florida |
| Township / Ward | Braintree |
| Est. Birth Year | ~1925 |
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 John | Age | Birth yr |
|---|---|---|---|---|
| Elizabeth Drinkwater | Other | — | 83 | ~1857 |
| John Cahill | Son | — | 15 | ~1925 |
| Winifred Drinkwater | Other | — | 41 | ~1899 |
| John Cahill | Head | — | 46 | ~1894 |
| Mary Cahill | Daughter | — | 11 | ~1929 |
| Lillian Cahill | Daughter | — | 12 | ~1928 |
| Winifred Cahill | Daughter | — | 12 | ~1928 |
| Alice Cahill | Spouse | — | 39 | ~1901 |
| Jane Cahill | Daughter | — | 13 | ~1927 |
Census Appearances
1930
Norfolk, Massachusetts
Son, age 5
Norfolk, Massachusetts · implied b. ~1925 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cahill |
| Given Name | John H. Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 5 |
| Marital Status | Single |
| Birthplace | Florida |
| Father's Birthplace | Massachusetts |
| Mother's Birthplace | Massachusetts |
| Birth State | Florida |
| Birth Country | United States |
| Birthplace (normalized) | florida |
1940
Norfolk-County, Massachusetts
Son, age 15
Norfolk-County, Massachusetts · implied b. ~1925 — 9 household members
| Surname | Cahill |
| Given Name | John H. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Florida |
| 1935 Residence (City) | Braintree |
| 1935 Residence (County) | Norfolk |
| Highest Grade | Hs 1 |
| 1935 Residence | Same place |
| Birth State | Florida |
| Birth Country | United States |
| Birthplace (normalized) | florida |
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 John Cahill across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Cahill
Son · 1940 · age 15 · b. ~1925 · Massachusetts
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Sibling
Winifred Cahill
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Jane Cahill
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Lillian Cahill
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Cahill
Sibling · 1940 · age 11
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 — Norfolk-County, Massachusetts
Open full size
1940 US Federal Census — Norfolk-County, Massachusetts
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01624-00431)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | John Deshleigh | 56 | Head | Night Watchman | England |
| 42 | Emily Deshleigh | 53 | Wife | — | Mass |
| 43 | Selina Deshleigh | 25 | Daughter | Billing Clerk | Mass |
| 44 | Luke Frazier | 61 | Head | Labourer | Canada Eng |
| 45 | Catherine Frazier | 55 | Wife | — | Canada Eng |
| 46 | Mabel A. Frazier | 17 | Daughter | — | Mass |
| 47 | Albert N. Frazier | 22 | Son | — | Mass |
| 48 | Homer J. Parent | 29 | Head | Salesman | Mass |
| 49 | Doris P. Parent | 27 | Wife | — | Mass |
| 50 | Joan M. Parent | 1 | Daughter | — | — |
| 51 | George G. Murray | 41 | Head | Machinist | Scotland |
| 52 | Mary A. Murray | 40 | Wife | — | Mass |
| 53 | Deliah Maher | 66 | Mother in law | — | Ireland |
| 54 | Helen M. Gaskill | 40 | Head | Bookkeeper | Maine |
| 55 | Gordon A. Gaskill | 15 | Son | — | Mass |
| 56 | Richard F. Gaskill | 14 | Son | — | Mass |
| 57 | Porter E. Holbrook | 41 | Head | Crossing Tender | Maine |
| 58 | Frances M. Holbrook | 35 | Wife | — | Maine |
| 59 | Ruth A. Holbrook | 13 | Daughter | — | Mass |
| 60 | Donald P. Holbrook | 10 | Son | — | Mass |
| 61 | Jean F. Holbrook | 9 | Daughter | — | Mass |
| 62 | Elliott Finney | 33 | Head | Radio Operator | New Hamp |
| 63 | Claire Finney | 33 | Wife | — | Mass |
| 64 | William Finney | 8 | Son | — | New Hamp |
| 65 | Elizabeth Finney | 6 | Daughter | — | — |
| 66 | Joseph B. Drinkwater | 55 | Head | Accountant | Mass |
| 67 | Lillian M. Drinkwater | 52 | Wife | — | Mass |
| 68 | Mildred B. Drinkwater | 22 | Daughter | Typist | Mass |
| 69 | Elsie F. Drinkwater | 17 | Daughter | — | Mass |
| 70 | Joseph S. Drinkwater | 15 | Son | — | Mass |
| 71 | John H. Cahill | 46 | Head | Salesman | Mass |
| 72 | Alice M. Cahill | 39 | Wife | — | Mass |
| 73 | John H. Cahill THIS PERSON | 15 | Son | — | Florida |
| 74 | Jane Cahill | 13 | Daughter | — | Mass |
| 75 | Winifred A. Cahill | 12 | Daughter | — | Mass |
| 76 | Lillian O. Cahill | 12 | Daughter | — | Mass |
| 77 | Mary L. Cahill | 11 | Daughter | — | Mass |
| 78 | Elizabeth A. Drinkwater | 83 | Mother in law | — | Mass |
| 79 | Winifred R. Drinkwater | 41 | Sister in law | Bookkeeper | Mass |
| 80 | John J. Heaney | 63 | Head | Chief Of Police | Ireland |
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)