"Familiality" or heritability.
Kendler
Kenneth S
KS
Neale
Michael C
MC
D004200:Diseases in Twins / Q000235:genetics / Q000523:psychology; D006801:Humans; D010641:Phenotype; D019655:Quantitative Trait, Heritable; D012307:Risk Factors; D012559:Schizophrenia / Q000235:genetics*; D012565:Schizophrenic Psychology; D055139:Sensory Gating / Q000235:genetics*; D012931:Social Environment; D009626:Terminology as Topic