noun which may take the genitive case particle 'no', noun
familial; running in families
Medical term used to describe diseases, traits, or conditions that occur in multiple family members, suggesting a genetic or hereditary component.
この病気には家族性が認められる。
A familial pattern is observed in this disease.
家族性高コレステロール血症は遺伝性の疾患です
Familial hypercholesterolemia is a hereditary disorder.
Compound of 家族 (family) and 性 (nature, -ity), literally 'family nature'. The exact historical derivation is uncertain, but the term is used in modern medical contexts.