- Mother of Marilyn Monroe. Gladys left her husband Martin Mortensen 4 months after their wedding. However, as they were still married when Marilyn was born, he is recognized as her legal father (he is named the father on her birth certificate). Biographers believe Charles Stanley Gifford (1898-1965), a salesman for Consolidated Films, where Gladys worked, is Marilyn's father. Mortensen divorced Gladys when "their child" was 26 months old. He nor Gifford played any part in Marilyn's life.
- Played by Patricia Richardson in Blonde (2001), Sheree North in Marilyn: The Untold Story (1980), Phyllis Coates in Goodnight, Sweet Marilyn (1989), Marla Adams in Marilyn and Me (1991), Terrence O'Connor in Norma Jean & Marilyn (1996), Susan Sarandon in The Secret Life of Marilyn Monroe (2015), and Julianne Nicholson in Blonde (2022).
- Daughter of Indiana-born Otis Monroe (1866-1909) and Missouri-born Della Mae (née Hogan) Monroe (1876-1927).
- Born in Piedras Negras, Coahuila while her father was there working for the National Railway of Mexico.
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