Maria Tomasa Perez was born circa 1779, the daughter of Juan Antonio Perez and Maria Santos Lopez.
In 1782, she lived at El Arcabuz. The church census recorded that she was a young child, española, and 3 years old. Her household included 8 people:
Juan Antonio Perez, español, married, age 36.
Maria Santos Lopez, española, married, age 36.
Jose Antonio Perez, español, a child, age 14.
Francisca Tomasa Perez, española, a young child, age 8.
Jose Andres Perez, español, a young child, age 6.
Juan Nepomuceno Perez, español, a young child, age 4.
Maria Tomasa Perez, española, a young child, age 3.
Jose Damacio Perez, español, a young child, age 1.