When Jose Flores Castro was born on 24 April 1904, in San Luis Potosí, Mexico, his father, Pedro Flores Jara, was 35 and his mother, Saturnina Cristina Castro Urbina, was 40. He married Irma Quirarte Sandoval in Juchipila, Zacatecas, Mexico. They were the parents of at least 1 son. He died on 15 July 1965, in Mexico City, Mexico, at the age of 61, and was buried in Mexico City, Mexico.