Per Wiki:
A genogram (also known as a McGoldrick-Gerson study, a Lapidus Schematic or a Family Diagram) is a pictorial display of a person's family relationships and medical history. It goes beyond a traditional family tree by allowing the user to visualize hereditary patterns and psychological factors that punctuate relationships. It can be used to identify repetitive patterns of behavior and to recognize hereditary tendencies.
I only went back 3 generations on my mother's side of the family (I know nothing about my dad's family). A lot of mental illness and drug/alcohol abuse. I wish I had known this before I picked up a drink. I am not blaming my alcoholism on family history, but it is another part of the puzzle. Genes load the gun and environment pulls the trigger.