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Mary Brennan — 1930 US Census Record
Model Tree available1930 United States Federal Census · Philadelphia, Pennsylvania
Our Model Tree links this Mary Brennan across the 1920, 1930 and 1940 US Censuses in Philadelphia, Pennsylvania (XGBoost, ~Confirmed), with identified parents Martin & Mary — first a daughter (b.~1915), then head of a 7-person household.
Age 15
b. ~1915
Female
Daughter
Born: Penna
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Philadelphia, Pennsylvania |
| Surname | Brennan |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Penna |
| Father's Birthplace | Penna |
| Mother's Birthplace | Penna |
| Additional Details | |
| Can Read/Write | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | penna |
| Township / Ward | Philadelphia 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.
7 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Brennan | Daughter | — | 15 | ~1915 |
| George Ross | Head | — | 31 | ~1899 |
| Walter Bright | Other | — | 20 | ~1910 |
| John Brennan | Son | — | 12 | ~1918 |
| William Ross | Son | — | 6 | ~1924 |
| Joseph Ross | Son | — | 4 | ~1926 |
| Emma Ross | Spouse | — | 33 | ~1897 |
Census Appearances
1920
Philadelphia, Pennsylvania
Daughter, age 5
Philadelphia, Pennsylvania · implied b. ~1915 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Brennan |
| Given Name | Mary |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 5 |
| Marital Status | Single |
| Birthplace | Penna |
| Father's Birthplace | Penna |
| Mother's Birthplace | Penna |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | penna |
1930
Philadelphia, Pennsylvania
Daughter, age 15
Philadelphia, Pennsylvania · implied b. ~1915 — 7 household members
| Surname | Brennan |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Penna |
| Father's Birthplace | Penna |
| Mother's Birthplace | Penna |
| Can Read/Write | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | penna |
1940
Philadelphia-County, Pennsylvania
Daughter, age 25
Philadelphia-County, Pennsylvania · implied b. ~1915 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Brennan |
| Given Name | Marion |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | Penna |
| 1935 Residence (City) | Phila |
| 1935 Residence (County) | Phila |
| Occupation | Clerk |
| Industry | Dept Store |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 1063 |
| Highest Grade | H-4 |
| 1935 Residence | Same place |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | penna |
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 Mary Brennan across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Martin Brennan (~0.92 confidence) and mother Mary Brennan (~0.92 confidence) and father Thomas Brennan (~0.92 confidence) and mother Emma Ross (~0.92 confidence) and father George Ross (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Martin Brennan
b. ~1875
Source father
● Household
· direct · ~0.92
Mother
Mary Brennan
b. ~1880
Source mother
● Household
· direct · ~0.92
Father
Thomas Brennan
b. ~1884
Source father
● Household
· direct · ~0.92
Mother
Emma Ross
b. ~1897
Source mother
● Household
· direct · ~0.92
Father
George Ross
b. ~1899
Source father
● Household
· direct · ~0.92
This person
Anchor record
Mary Brennan
Daughter · 1930 · age 15 · b. ~1915 · Pennsylvania
★ You are viewing this record
Sibling
Joseph Ross
Sibling · 1930 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Ross
Sibling · 1930 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Brennan
Sibling · 1930 · age 12
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 — Philadelphia, Pennsylvania
Open full size
1930 US Federal Census — Philadelphia, Pennsylvania
Page Contents
50 people indexed on this census page (ia:1930:fifteenthcensus00reel2092:0045)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | John Wickerser | 35 | Head | Laborer | Penna |
| 2 | Alice Wickerser | 42 | Wife | — | Penna |
| 3 | Krause Walter Wickerser | 19 | Son | Laborer | Penna |
| 4 | Alice Wickerser | 16 | Daughter | — | Penna |
| 5 | Paul Wickerser | 14 | Son | — | Penna |
| 6 | Edna Wickerser | 12 | Daughter | — | Penna |
| 7 | John Jr Wickerser | 8 | Son | — | Penna |
| 8 | Emily Wickerser | 3 | Daughter | — | Penna |
| 9 | Fred Nelson | 39 | Head | Laborer | Denmark |
| 10 | Mary Nelson | 35 | Wife | — | Penna |
| 11 | Fred Jr Nelson | 7 | Son | — | Penna |
| 12 | Louise Nelson | 6 | Daughter | — | Penna |
| 13 | James Nelson | 4 | Son | — | Penna |
| 14 | Theresa Nelson | 1 | Daughter | — | Penna |
| 15 | James Mcdermott | 32 | Boarder | Chauffeur | Penna |
| 16 | William Bowles | 39 | Head | Inspector | Penna |
| 17 | Cathrine Bowles | 45 | Wife | — | Penna |
| 18 | Helen Divine | 18 | Stepdaughter | Cigar Maker | Penna |
| 19 | William Divine | 19 | Stepson | — | Penna |
| 20 | Caroline Divine | 11 | Stepdaughter | — | Penna |
| 21 | Bruno Milla | 26 | Head | Engineer | Russia |
| 22 | Wilimina Milla | 21 | Wife | — | New Jersey |
| 23 | Dorothy Milla | 1 | Daughter | — | Penna |
| 24 | Margaret Craigent | 50 | Head | — | New Jersey |
| 25 | John H Kelley | 39 | Head | — | Penna |
| 26 | Ruth Kelley | 31 | Wife | — | Penna |
| 27 | James Jr Kelley | 13 | Son | — | Penna |
| 28 | Ruth Kelley | 11 | Daughter | — | Penna |
| 29 | Edward Kelley | 10 | Son | — | Penna |
| 30 | Thomas Kelley | 7 | Son | — | Penna |
| 31 | James Boyle | 62 | Uncle | Huckster | Penna |
| 32 | James Walker | 48 | Lodger | Carpenter | Penna |
| 33 | George Ross | 31 | Head | Chauffeur | Penna |
| 34 | Emma Ross | 33 | Wife | — | Penna |
| 35 | Mary Brennan THIS PERSON | 15 | Daughter | — | Penna |
| 36 | John Brennan | 12 | Son | — | Penna |
| 37 | William Ross | 6 | Son | — | Penna |
| 38 | Joseph Ross | 4 | Son | — | Penna |
| 39 | Walter Bright | 20 | Boarder | — | Penna |
| 40 | Thomas Mckenna | 32 | Head | Laborer | Penna |
| 41 | Martha Mckenna | 28 | Wife | — | Penna |
| 42 | Thomas Jr Mckenna | 4 | Son | — | Penna |
| 43 | Ed Murphy | 63 | Boarder | — | Penna |
| 44 | John O Wehrwein | 23 | Head | Chauffeur | New Jersey |
| 45 | Viola Wehrwein | 23 | Wife | — | Penna |
| 46 | Betty A Wehrwein | 4 | Daughter | — | Penna |
| 47 | John E Wehrwein | 2 | Son | — | New Jersey |
| 48 | Adolf Anderson | 62 | Head | Rigger | Norway |
| 49 | Jennie Anderson | 55 | Wife | — | Norway |
| 50 | Jennie Anderson | 15 | Daughter | — | Penna |
Related Census Records
Pedigree Summary
Mary + 3 siblings
Gen 1 · 5 parents
~0.92
Max depth 4 (1900–1950 window)
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)