Marlon Brando's life decisions were greatly affected by familial tragedies, particularly the impact of his father’s alcoholism and his mother’s mental health issues. These struggles during his early years contributed to his feelings of abandonment and emotional turmoil. Brando often drew upon these personal experiences as inspiration for his roles, leading him to explore complex characters facing their own demons. His turbulent family background influenced his approach to acting, as he sought to convey authentic portrayals of vulnerability and depth in his performances.