- Father was a Filipino lawyer Generoso Hernandez and mother was Mexican Marina.
- Actress Rosario H. Panganiban was the cousin of her father. It was Rosario H. Panganiban, wife of director Vicente Salumbides, who opened her door in exploring a career in the movies.
- She wrote her biographical book, "No Regrets", published in 2009.
- She was a faculty member of John Robert Powers Philippines, a popular personality development school. She taught etiquette, art of conversation, deportment and conduct to students, composed mostly by young, married women.
- Husband Leo Prieto was a commissioner of Philippine Basketball Association.
- The popular Filipino serenade song Ikaw was written by Mike Velarde for Yolanda Marquez.
- She and her best friends Patricia Mijares, Lilian Velez, and Norma Blancaflor opened a restaurant in San Marcelino St, Manila City which was frequented by basketball players. There, she met her future husband Leo Prieto, a basketball player, who became the founding commissioner of the Philippine Basketball Association (PBA) in 1975.
- Was a newspaper columnist with her regular fashion and beauty page column Just Asking appearing in Philippine Star.
- She was the first actress in Philippine cinema to buck the conservative dress code by appearing in shorts and slacks in her movies.
- Dubbed as the Philippines' Miss Manners.
- In 2003 when she was 83, she appeared in a Bench campaign on its fashion for all ages.
- Born in US, she moved to the Philippine at age 14 to stay in Macabebe, her father's hometown. With this, movie press dubbed her the "The Original Balikbayan." Balikbayan is a Filipino word for something who returned home to the Philippines.
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