RM
Robert May — 1940 US Census Record
Model Tree available1940 United States Federal Census · San-Francisco-County, California
Our Model Tree links this Robert May across the 1920, 1930 and 1940 US Censuses in San-Francisco-County, California (XGBoost, ~Confirmed), with identified parents Angelo & Lucy — first a son (b.~1915), then head of a 3-person household.
Age 25
b. ~1915
Male
Son
Born: California
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | San-Francisco-County, California |
| Surname | May |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | California |
| 1935 Residence (City) | San Francisco City |
| 1935 Residence (County) | San Francisco |
| Additional Details | |
| Occupation | President |
| Industry | Clothing Manufac |
| Class of Worker | E |
| Hours Worked | 44 |
| Income (1939) | 1560 |
| Highest Grade | C-2 |
| 1935 Residence | Same place |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
| Occupation | President |
| Township / Ward | San Francisco 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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Robert | Age | Birth yr |
|---|---|---|---|---|
| Robert May | Son | — | 25 | ~1915 |
| June May | Daughter | — | 22 | ~1918 |
| Lucy May | Head | — | 55 | ~1885 |
Census Appearances
1920
San Francisco, …
Son, age 5
San Francisco, California · implied b. ~1915 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | May |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 5 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | Oregon |
| Mother's Birthplace | New York |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1930
San Francisco, …
Son, age 16
San Francisco, California · implied b. ~1914 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | May |
| Given Name | Robert J |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | California |
| Father's Birthplace | Oregon |
| Mother's Birthplace | New York |
| Can Read/Write | Yes |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
1940
San-Francisco-County, California
Son, age 25
San-Francisco-County, California · implied b. ~1915 — 3 household members
| Surname | May |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | California |
| 1935 Residence (City) | San Francisco City |
| 1935 Residence (County) | San Francisco |
| Occupation | President |
| Industry | Clothing Manufac |
| Class of Worker | E |
| Hours Worked | 44 |
| Income (1939) | 1560 |
| Highest Grade | C-2 |
| 1935 Residence | Same place |
| Birth State | California |
| Birth Country | United States |
| Birthplace (normalized) | california |
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 May across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Angelo May (~0.92 confidence) and mother Lucy May (~0.92 confidence) and mother Nellie May (~0.92 confidence) and mother Lucy May (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Angelo May
b. ~1880
Source father
● Household
· direct · ~0.92
Mother
Lucy May
b. ~1885
Source mother
● Household
· direct · ~0.92
Mother
Nellie May
b. ~1885
Source mother
● Household
· direct · ~0.92
Mother
Lucy May
b. ~1886
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Robert May
Son · 1940 · age 25 · b. ~1915 · California
★ You are viewing this record
Sibling
June May
Sibling · 1940 · age 22
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 — San-Francisco-County, California
Open full size
1940 US Federal Census — San-Francisco-County, California
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00321-00124)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Herbert C. Ralph | 30 | Son-in-law | Salesman | California |
| 2 | Dorothy G. Ralph | 26 | Daughter | Typist Clerk | California |
| 3 | Irving Burke | 31 | Head | Chiropodist | New York |
| 4 | Rose Burke | 31 | Wife | — | New York |
| 5 | Sheila Burke | 5 | Daughter | — | California |
| 6 | Elaine Burke | 4 | Daughter | — | California |
| 7 | Evelyn Cohell | 33 | Lodger | Advertising | Oregon |
| 8 | Michael Vile Genova | 60 | Head | Barber | Italy |
| 9 | Molly Vile Genova | 50 | Wife | — | Italy |
| 10 | Mary Vile Genova | 24 | Daughter | Pantry Cook | New York |
| 11 | Joe Vile Genova | 22 | Son | New Worker | Pennsylvania |
| 12 | Amy Vile Genova | 21 | Daughter | Beautician | Pennsylvania |
| 13 | Tony Vile Genova | 16 | Son | — | Pennsylvania |
| 14 | Mary Pinta | 86 | Mother | — | Italy |
| 15 | Francis Italy | 35 | Head | Clerk | California |
| 16 | Louise Italy | 32 | Wife | — | Wisconsin |
| 17 | Carole Italy | 11 | Daughter | — | California |
| 18 | Ira Whidden | 41 | Head | Photography | North Dakota |
| 19 | Violet Whidden | 33 | Wife | Photography | Montana |
| 20 | Virginia Marquett | 26 | Head | Secretary | Utah |
| 21 | J. Parker Brewer | 57 | Head | Clerk | Illinois |
| 22 | Gertrude Brewer | 57 | Wife | Saleslady | Illinois |
| 23 | Kalliope Preovolos | 50 | Head | — | Greece |
| 24 | John Preovolos | 26 | Son | Teller | California |
| 25 | James Preovolos | 21 | Son | — | California |
| 26 | Edward Hageman | 63 | Head | Bartender | California |
| 27 | Ida Hageman | 43 | Wife | — | California |
| 28 | Edward Jr. Hageman | 24 | Son | Asst Superintendent | California |
| 29 | Edna Ward | 63 | Mother-in-law | — | California |
| 30 | Peter Christensen | 58 | Head | Engineer | Denmark |
| 31 | Frances Christensen | 62 | Wife | — | California |
| 32 | Frank N. Lone | 50 | Head | Operator | California |
| 33 | Beatrice Lone | 50 | Wife | — | California |
| 34 | Joseph Stuart | 59 | Head | Building Inspector | Canada |
| 35 | Elizabeth Stuart | 50 | Wife | — | California |
| 36 | Drakney Clark | 36 | Head | Knitwearer | Ohio |
| 37 | Emma Nevada Clark | 39 | Wife | — | Nevada |
| 38 | Lucy May | 55 | Head | — | New York |
| 39 | Robert May THIS PERSON | 25 | Son | President | California |
| 40 | June May | 22 | Daughter | Social Worker | California |
Pedigree Summary
Robert + 1 sibling
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 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)