He was born circa 1744. His father was Francisco Lopez de Jaen, and his mother was Maria Agustina Longoria. His father owned Porción 12, Camargo. In 1750, he lived in Camargo. The census recorded that he was the son of a settler, español, and 6 years old. His household had 14 people, including 3 servants, and they received government aid to move to the colony.