Maria Francisca Casilda Vela was born circa 1774, the daughter of Bernardo Vela and Maria Josefa Peña.
In 1782, she lived in Mier. The church census recorded that she was a child, española, and 8 years old. Her household included 7 people:
Maria Josefa Peña , a widow, age 49.
Juan de Dios Vela , single, age 26.
Gertrudis Vela, española, an unmarried girl, age 19.
Maria Teresa Vela, española, an unmarried girl, age 21.
Felipe Vela, español, a youth, age 19.
Apolinaro Vela, español, a youth, age 17.
Maria Francisca Casilda Vela, española, a child, age 8.