Maria Josefa Montalvo was the daughter of Antonio Montalvo and Maria Petra Salinas.
In 1782, she lived at Las Jaras. The church census recorded that she was an unmarried girl, española. Her household included 14 people:
Don Antonio Montalvo, español, married. He was the ranch owner.
Maria Petra Salinas, española, married.
Maria del Carmen Montalvo, española, an unmarried girl.
Francisco Ignacio Montalvo, español, a youth.
Maria Josefa Montalvo, española, an unmarried girl.
Maria Cirila Montalvo, española, an unmarried girl.
Maria Teodora Montalvo, española, an unmarried girl.
Jose Antonio Montalvo, español, a child.
Maria Rosa Montalvo, española, a child.
Francisco Antonio Montalvo, español, a young child.
Juana Maria Montalvo, española, a young child, age 4.
Maria Gertrudis Montalvo, española, a young child, age 3.
Maria Antonia Montalvo, española, a young child, age 2.
Joaquin Montalvo español, age 48.