Jose Antonio Saenz was born circa 1775, the son of Juan Francisco Saenz and Maria Teresa Peña.
In 1782, he lived at San Pedro de las Flores. The church census recorded that he was a child, español, and 7 years old. His household included 9 people:
Juan Francisco Saenz, español, married, age 53. He was the ranch owner.
Maria Teresa Peña, española, married, age 49.
Jose Felipe Saenz, español, a youth, age 19.
Jose Gabriel Saenz, español, a youth, age 18.
Juan Francisco Saenz, español, a child, age 14.
Maria Gertrudis Saenz, española, a child, age 11.
Maria Josefa Saenz, española, a child, age 9.
Jose Antonio Saenz, español, a child, age 7.
Jose Francisco Saenz, español, a young child, age 3.