Marilyn Monroe was born on June 1, 1926, in Los Angeles, California, United States. She was the daughter of Gladys Pearl (Monroe) Baker, a film technician. Monroe's father is unknown, however, some sources of information stated, that Charles Stanley Gifford was her real father.
Gladys, Marilyn's mother, was born into a poor Midwestern family, who settled down in California at the turn of the century. When Gladys was 15, she married John Newton Baker, an abusive man nine years her senior. The couple gave birth to two children - Robert (1917-1933) and Berniece (b. 1919). Gladys and John divorced in 1923.
It was in 1924, that Marilyn's mother married her second husband - Martin Edward Mortensen. However, the couple broke up only some months later and divorced in 1928.
Monroe was not told, that she had a sister until she was 12 and met her for the first time as an adult.