He was born circa 1741. His father was Juan Jose Lopez de Jaen, and his mother was Isabel Maria Sanchez. His mother owned land in Porción 20, Revilla, Zapata County. In 1750, he lived in Camargo. The census recorded that he was the son of a settler, español, and 9 years old. His household had 4 people, and they received government aid to move to the colony.