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John Brennan — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Montgomery, Pennsylvania
Our Model Tree links this John Brennan across the 1930 and 1940 US Censuses in Montgomery, Pennsylvania (XGBoost, ~Confirmed) — first a son (b.~1913), then head of a 10-person household.
Age 17
b. ~1913
Male
Son
Born: Pennsylvania
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Montgomery, Pennsylvania |
| Surname | Brennan |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Irish Free State |
| Mother's Birthplace | Irish Free State |
| Additional Details | |
| Occupation | Draftsman |
| Industry | Auto Factory |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Occupation | Draftsman |
| Township / Ward | Ardmore |
| Est. Birth Year | ~1913 |
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.
10 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Eileen Brennan | Daughter | — | 7 | ~1923 |
| Mary Brennan | Daughter | — | 22 | ~1908 |
| Marguerite Brennan | Daughter | — | 14 | ~1916 |
| Catherine Brennan | Daughter | — | 20 | ~1910 |
| Frances Brennan | Daughter | — | 12 | ~1918 |
| John Brennan | Head | — | 48 | ~1882 |
| Thomas Brennan | Son | — | 10 | ~1920 |
| William Brennan | Son | — | 15 | ~1915 |
| John Brennan | Son | — | 17 | ~1913 |
| Bessie Brennan | Spouse | — | 46 | ~1884 |
Census Appearances
1930
Montgomery, Pennsylvania
Son, age 17
Montgomery, Pennsylvania · implied b. ~1913 — 10 household members
| Surname | Brennan |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Irish Free State |
| Mother's Birthplace | Irish Free State |
| Occupation | Draftsman |
| Industry | Auto Factory |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1940
Montgomery-County, Pennsylvania
Other, age 25
Montgomery-County, Pennsylvania · implied b. ~1915 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Brenan |
| Given Name | John |
| Relationship to Head | Lodger |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Ardmore |
| 1935 Residence (County) | Montgomery |
| Occupation | Toolmaker |
| Industry | Tool & Die Factory |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 521800 |
| Highest Grade | H 4 |
| 1935 Residence | Same place |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
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 Brennan across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Brennan
Son · 1930 · age 17 · b. ~1913 · Pennsylvania
★ You are viewing this record
Sibling
Marguerite Brennan
Sibling · 1930 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Frances Brennan
Sibling · 1930 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Thomas Brennan
Sibling · 1930 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Brennan
Sibling · 1930 · age 22
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Brennan
Sibling · 1930 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Catherine Brennan
Sibling · 1930 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Eileen Brennan
Sibling · 1930 · age 7
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
1930 US Federal Census — Montgomery, Pennsylvania
Open full size
1930 US Federal Census — Montgomery, Pennsylvania
Page Contents
50 people indexed on this census page (ia:1930:fifteenthcensus00reel2082:0609)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | John Brennan | 48 | Head | Watchman | Irish Free State |
| 2 | Bessie Brennan | 46 | Wife | — | Irish Free State |
| 3 | Mary Brennan | 22 | Daughter | Clerk | Pennsylvania |
| 4 | Catherine Brennan | 20 | Daughter | Clerk | Pennsylvania |
| 5 | John Brennan THIS PERSON | 17 | Son | Draftsman | Pennsylvania |
| 6 | William Brennan | 15 | Son | — | Pennsylvania |
| 7 | Marguerite Brennan | 14 | Daughter | — | Pennsylvania |
| 8 | Frances Brennan | 12 | Daughter | — | Pennsylvania |
| 9 | Thomas Brennan | 10 | Son | — | Pennsylvania |
| 10 | Eileen Brennan | 7 | Daughter | — | Pennsylvania |
| 11 | Mary Quinlan | 30 | Head | — | Irish Free State |
| 12 | John Quinlan | 10 | Son | — | Pennsylvania |
| 13 | Mary Quinlan | 7 | Daughter | — | Pennsylvania |
| 14 | Lillian Quinlan | 5 | Daughter | — | Pennsylvania |
| 15 | Mary Muller | 33 | Roomer | Cook | Pennsylvania |
| 16 | Alice Helen Muller | 10 | Roomer | — | Pennsylvania |
| 17 | Adrienne Muller | 6 | Roomer | — | Pennsylvania |
| 18 | George Muller | 3 | Roomer | — | Pennsylvania |
| 19 | Sarah Seyford | 60 | Head | — | Northern Ireland |
| 20 | Hugh Strain | 67 | Brother | — | Northern Ireland |
| 21 | Frank Strain | 48 | Brother | — | Northern Ireland |
| 22 | Frank J. Ruthy | 62 | Head | Tailor | Pennsylvania |
| 23 | Mary Ruthy | 63 | Wife | — | Northern Ireland |
| 24 | Leah Ruthy | 33 | Daughter | — | Pennsylvania |
| 25 | George Humphries | 51 | Brother-in-law | Clerk | Northern Ireland |
| 26 | Mary Watson | 60 | Head | — | Scotland |
| 27 | William Watson | 28 | Son | Driver | Pennsylvania |
| 28 | John Keons | 32 | Boarder | Patrolman | Northern Ireland |
| 29 | Thomas Keons | 34 | Boarder | Laborer | Northern Ireland |
| 30 | Christopher Cumberland | 50 | Boarder | Mechanic | Northern Ireland |
| 31 | Abraham Lerner | 37 | Head | Proprietor | Russia |
| 32 | May S. Lerner | 33 | Wife | — | Russia |
| 33 | Jay Lerner | 10 | Son | — | Pennsylvania |
| 34 | Morris Lerner | 6 | Son | — | Pennsylvania |
| 35 | Nora Jackson | 54 | Head | Cook | Maryland |
| 36 | William B. Jackson | 24 | Son | Butler | Maryland |
| 37 | Anna Blerins | 21 | Daughter | Maid | Maryland |
| 38 | Mary Eleanor Blerins | 6 | Granddaughter | — | Maryland |
| 39 | Ruth L. Blerins | 2 | Granddaughter | — | Pennsylvania |
| 40 | Norman Mask | 19 | Nephew | Laborer | Maryland |
| 41 | Mary Elizabeth Mask | 17 | Niece | Maid | Maryland |
| 42 | H. Anna White | 16 | Boarder | — | Delaware |
| 43 | Fred Norman | 25 | Head | Butler | North Carolina |
| 44 | Edna Norman | 21 | Wife | Maid | Maryland |
| 45 | Watson Ruffins | 31 | Roomer | Chauffeur | Virginia |
| 46 | Mercy Ruffins | 26 | Roomer | Maid | Virginia |
| 47 | Mona Rosoff | 52 | Head | Proprietor | Russia |
| 48 | Max Rosoff | 29 | Son | — | Russia |
| 49 | Reba Rosoff | 24 | Daughter | Clerk | Pennsylvania |
| 50 | Mattie Cherry | 43 | Servant | Maid | North Carolina |
Related Census Records
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1930 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)