Jose Marcelino Olivares was born circa 1766, the son of Jose Antonio Olivares and Maria Catarina Peña.
In 1782, he lived at El Cojo. The church census recorded that he was a youth, español, and 16 years old. His household included 9 people:
Jose Antonio Olivares, español, married, age 38.
Maria Catarina Peña, española, married, age 37.
Jose Salvador de Olivares, español, single, age 21.
Maria Teresa Olivares, española, an unmarried girl, age 19.
Jose Marcelino Olivares, español, a youth, age 16.
Jose de los Reyes Olivares, español, a child, age 11.
Jose Julian Olivares, español, a child, age 9.
Jose Vicente Olivares, español, a young child, age 5.
Maria Josefa Cesaria Olivares, española, a young child, age 5.