Closer to home, the Mitla Cafe opened in San Bernardino, and four siblings living nearby each gave birth to a baby in 1937.
The cousins, born the same year as the Mitla Cafe, still hang out there.
On Wednesday, three generations of that family gathered for lunch, enjoying the homemade Mexican food.
Dozens of cousins - first, second and third - sat around a long stretch of table in the Mitla dining room, laughing and reminiscing.
In the old days, they would have had to walk across the street - Mount Vernon Avenue - from the Craftsman bungalow built by their grandfather, Margarito Saenz.
The cousins' grandparents, married in the late 1880s, had a dozen children, and subsequent generations expanded exponentially.
Now the oldest generation, the first cousins perused old pictures, even passing around the 1912 San Bernardino building permit issued to Grandpa Seanz. Fee for the permit: 50 cents.
The cousins, Gil Saenz, a land development consultant from Beaumont; Carlos Hernandez, managing director of Industrial Asphalt Inc., from Murrieta; Margarito Saenz, a former councilman from Barstow; and Mary Lou "Lulu" Saenz De le Torre, a retired bilingual tutor for the San Bernardino City Unified School District, also from Beaumont, are second-generation Americans, all born in 1937 on Mount Vernon Avenue.
They all attended Mount Vernon Elementary School and graduated from San Bernardino High School.
Over the years, family get-togethers would include a meal at the landmark Route 66 restaurant.
Christenings, graduations, birthdays, soccer games.
In the 1940s, the family played baseball in the streets.
"The streets were always safe then," Gil Saenz said.
As the Mitla Cafe expanded, the Saenzes did the same. According to the family's best estimate, they now number about 300.
"It's so hard to plan a get-together so everyone can show up," Lulu De la Torre said. "There are too many to count. We've had our last three reunions at Mission Bay in San Diego. We need name tags."
Irene Montano, owner of the Mitla for the last 27 years, said the restaurant expanded during World War II when there were so many customers from Norton Air Force Base.
"Our menu hasn't changed much but our prices have," she said, smiling.
Throughout the year, the restaurant will celebrate its diamond anniversary with special events.
Lulu De la Torre said she remembered when Mitla's would serve 10-cent tacos from 2 to 4 p.m. at the back door.
Edward Saenz, a second cousin, said everyone used to try to figure out what `Mitla's' meant.
"That's easy," said Steven Oquendo, great-grandson of original Mitla owners Lucia and Salvador Rodriguez.
"Mitla's is named after the ancient ruins, the City of the Dead, in Oaxaca, Mex," Oquendo said.
These days, the Saenz family is striving not to lose touch.
"Mitla's continues to help keep the family close," De la Torre said. "But it's sad if the youngest generations don't keep the big family together."