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Mary Brennan — 1920 US Census Record
Model Tree available1920 United States Federal Census · Ada, Idaho
Our Model Tree links this Mary Brennan across the 1910, 1920 and 1930 US Censuses in Ada, Idaho (XGBoost, ~Confirmed), with identified parents Katie & James — first a daughter (b.~1905), then head of a 7-person household.
Age 15
b. ~1905
Female
Daughter
Born: Montana
Single
1920 Census Record Details
| Census Year | 1920 |
| Location | Ada, Idaho |
| Surname | Brennan |
| Given Name | Mary C. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Montana |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Additional Details | |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | Irish |
| Birth State | Montana |
| Birth Country | United States |
| Birthplace (normalized) | montana |
| Township / Ward | Precinct 15 |
| Est. Birth Year | ~1905 |
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 1920 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Brennan | Daughter | — | 15 | ~1905 |
| Margaret Brennan | Daughter | — | 13 | ~1907 |
| Ralph Brennan | Head | — | 42 | ~1878 |
| Thomas Provitt | Other | — | 25 | ~1895 |
| William Brennan | Son | — | 17 | ~1903 |
| Patrick Brennan | Son | — | 19 | ~1901 |
| James Brennan | Son | — | 18 | ~1902 |
Census Appearances
1910
Ada, Idaho
Daughter, age 6
Ada, Idaho · implied b. ~1904 — 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 | 6 |
| Marital Status | Single |
| Birthplace | Montana |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Can Read | No |
| Can Write | No |
| Speaks English | English |
| Birth State | Montana |
| Birth Country | United States |
| Birthplace (normalized) | montana |
1920
Ada, Idaho
Daughter, age 15
Ada, Idaho · implied b. ~1905 — 7 household members
| Surname | Brennan |
| Given Name | Mary C. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Montana |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | Irish |
| Birth State | Montana |
| Birth Country | United States |
| Birthplace (normalized) | montana |
1930
Ada, Idaho
Daughter, age 25
Ada, Idaho · implied b. ~1905 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Brannen |
| Given Name | Mary B. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | Montana |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Occupation | Nurse |
| Industry | Hospital |
| Class of Worker | W |
| Can Read/Write | Yes |
| Veteran | No |
| Birth State | Montana |
| Birth Country | United States |
| Birthplace (normalized) | montana |
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 (1910, 1920 and 1930) in Ada, Idaho, using XGBoost record linkage. Identified parents: mother Katie Brannen (~0.92 confidence) and father James Brennan (~0.92 confidence) and mother Katie Brennan (~0.92 confidence) and father Ralph Brennan (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Katie Brannen
b. ~1870
Source mother
● Household
· direct · ~0.92
Father
James Brennan
b. ~1871
Source father
● Household
· direct · ~0.92
Mother
Katie Brennan
b. ~1871
Source mother
● Household
· direct · ~0.92
Father
Ralph Brennan
b. ~1878
Source father
● Household
· direct · ~0.92
This person
Anchor record
Mary Brennan
Daughter · 1920 · age 15 · b. ~1905 · Idaho
★ You are viewing this record
Sibling
William Brennan
Sibling · 1920 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Patrick Brennan
Sibling · 1920 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Brennan
Sibling · 1920 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Brennan
Sibling · 1920 · age 13
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
1920 US Federal Census — Ada, Idaho
Open full size
1920 US Federal Census — Ada, Idaho
Page Contents
50 people indexed on this census page (ia:1920:14thcensusofpopu287unit:0220)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | Ralph Brennan | 42 | Head | — | Missouri |
| 52 | Patrick Brennan | 19 | Son | Laborer | Montana |
| 53 | James Brennan | 18 | Son | Laborer | Texas |
| 54 | William Brennan | 17 | Son | Laborer | Texas |
| 55 | Mary C. Brennan THIS PERSON | 15 | Daughter | — | Montana |
| 56 | Margaret Brennan | 13 | Daughter | — | Montana |
| 57 | Thomas A. Provitt | 25 | Lodger | Laborer | Scotland |
| 58 | Ella Rambo | 55 | Head | — | Illinois |
| 59 | William Rambo | 25 | Son | Laborer | Kansas |
| 60 | Archie Rambo | 22 | Son | Laborer | Kansas |
| 61 | Ollie Burd | 29 | Daughter | Laundress | Kansas |
| 62 | Carl Burd | 5 | Grandson | — | Idaho |
| 63 | Floyd Graham | 30 | Head | Truck Driver | Missouri |
| 64 | Beulah Graham | 27 | Wife | — | Missouri |
| 65 | George H. Devore | 6 | Stepdaughter | — | Iowa |
| 66 | Earl W. Devore | 4 | Stepson | — | Oregon |
| 67 | James Biron | 51 | Head | Laborer | Canada |
| 68 | Emma Biron | 51 | Wife | — | Michigan |
| 69 | Albert G. Biron | 21 | Son | Laborer | Idaho |
| 70 | Louis Biron | 18 | Son | Laborer | Idaho |
| 71 | Francis Biron | 14 | Daughter | — | Idaho |
| 72 | Charles W. Conrad | 46 | Head | Laborer | Illinois |
| 73 | Alice Conrad | 41 | Wife | — | Illinois |
| 74 | Mildred Conrad | 16 | Daughter | — | Illinois |
| 75 | James Conrad | 14 | Son | — | Illinois |
| 76 | Mary Conrad | 12 | Daughter | — | Illinois |
| 77 | Margaret Conrad | 10 | Daughter | — | Illinois |
| 78 | William Conrad | 8 | Son | — | Illinois |
| 79 | Fred Mason | 45 | Head | Laborer | Illinois |
| 80 | Hattie Mason | 32 | Wife | — | Idaho |
| 81 | Margaret Mason | 12 | Daughter | — | Idaho |
| 82 | Fred Mason | 10 | Son | — | Idaho |
| 83 | Elmer Mason | 3 | Son | — | Idaho |
| 84 | Clarence Mason | 2 | Son | — | Idaho |
| 85 | James Webb | 52 | Head | Carpenter | Missouri |
| 86 | Agnes Webb | 52 | Wife | — | Missouri |
| 87 | Rena Webb | 14 | Daughter | — | Missouri |
| 88 | James Webb | 4 | Son | — | Missouri |
| 89 | Raymond Perry | 27 | Head | Laborer | Missouri |
| 90 | Mayme Perry | 24 | Wife | — | Missouri |
| 91 | Nelson Perry | 4 | Son | — | Missouri |
| 92 | Roy H. Cary | 23 | Head | Laborer | Missouri |
| 93 | Verna D. Cary | 22 | Wife | — | Missouri |
| 94 | Grace L. Cary | 1 | Daughter | — | Missouri |
| 95 | Joe Paris | 35 | Head | Laborer | Missouri |
| 96 | Lulu Paris | 35 | Wife | Laundress | Missouri |
| 97 | Lola Paris | 12 | Daughter | Laundress | Missouri |
| 98 | Anna Paris | 10 | Daughter | Laundress | Missouri |
| 99 | Viola Paris | 8 | Daughter | — | Missouri |
| 100 | Dora Paris | 6 | Daughter | — | Missouri |
Pedigree Summary
Mary + 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 1920 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)