Marilyn always believed insanity ran in her family. However, this is not entirely true.
Marilyn’s great grandfather Tilford Hogan committed suicide in 1933 due to his failing health and the Great Depression.
Marilyn’s grandfather, Otis Monroe died in 1909 from syphilis of the brain. His wife, Della, believed that her husband died from a mental disorder which is incorrect.
Della later suffered from an inflammation of the heart which caused her to have many mood swings and manic-depressive states. She rarely saw the doctor or remembered to take her medication. There was no psychological profile relating to her death, which was caused by heart disease.
Marilyn’s mother Gladys also suffered from being run down from working long hours, inhaling dangerous chemicals whilst working as a film cutter, as well as depression and mood swings. She was then given medication that triggered abnormal behaviour. The effects of many medicines were unknown especially when it came to mental health.