Family history is a risk factor for many complex diseases of public health significance ). Specifically, family history has historically served as an important validator for definitions
of psychiatric disorders Further, it has been proposed that stratifying patients by their family antecedents may reduce heterogeneity and facilitate the identification of genetic risk factors On the other hand, an intriguing finding in psychosis research is that, despite schizophrenia and
other psychoses running in families, most affected individuals do not have family history of the illness