An adult child of an alcoholic (ACOA) refers to individuals who grew up in homes with substance-abusing parents, leading to various dysfunctional family roles such as the family hero, enabler, mascot, lost child, and scapegoat. These roles are accompanied by typical behaviors and emotional struggles, including a lack of trust, fear of feelings, and difficulties in intimate and interpersonal relationships. ACOAs often cope with their traumatic upbringing through people-pleasing habits and a fear of vulnerability, further complicating their adult lives.