Marin was born Rosario Spindola in Mexico City, Mexico. Her father Mariano, a worker in a label-making factory in California, brought his family to the United States in 1972 on visas provided by his employer. The move was initially resisted by Marin due to her upcoming "quinceañera" and her fear of leaving behind her customs and traditions. Marin's family settled in Huntington Park, California where her father obtained work as a janitor and her mother as a seamstress. They returned briefly to their old home in Mexico to celebrate a "small fiesta" in her honor.