A genogram is a family map or history that uses special symbols to describe relationships, major events, and the dynamics of a family over multiple generations. Think of it as an extremely detailed family tree. Mental health and medical professionals often use genograms to identify patterns of mental and physical illnesses such as depression, bipolar disorder, cancer and other genetic diseases. To begin a genogram you will need to interview family members first. Then, you can use standard genogram symbols to create a diagram that documents your family's specialized history.