He was born circa 1775. His father was Ygnacio Flores, and his mother was Maria Lugarda Treviño.
In 1791, he lived in Mier in household number 15. The church census recorded that he was a youth, español, and 16 years old. His household included 7 people:
Ygnacio Flores, married, español, age 47.
Maria Lugarda Treviño, married, española, age 48.
Joseph Antonio Flores, a youth, español, age 16.
Antonio Joseph Flores, a child, español, age 14.
Marcelino Flores, a child, español, age 9.
Jose Joaquin Flores, a child, español, age 5.
Maria Gertrudis Flores, a young child, española, age 2.