Jose Sixto Peña was born circa 1758, the son of Jose Cruz Peña and Ana Maria Gutierrez.
He married Maria Rita de la Garza on 11 Jun 1779 in Mier.
In 1782, he lived at Juntas del Rio. The church census recorded that he was married, casta, and 25 years old. His household included 2 people:
Jose Sixto Peña, casta, married, age 25.
Maria Rita de la Garza, casta, married, age 20.