He was born circa 1757. His father was Francisco Guerra, and his mother was Ana Josefa de la Garza. His father owned Porción 66, Mier. In 1782, he lived in Mier in household number 36. The church census recorded that he was single, español, and 25 years old. His household included 8 people. In 1791, he lived in Mier in household number 30. The church census recorded that he was single, español, and 33 years old. His household included 6 people.
He married Maria Rosalia Hinojosa, daughter of Manuel Hinojosa [Jr.] and Juana Sanchez on 6 Aug 1794. He was 37 years old, and the bride was 34 years old. Her father owned Porción 5, Mier.