血けつ縁えん関かん係けい

noun, noun which may take the genitive case particle 'no'

blood relationship; consanguinity

Refers to a relationship by blood or genetic connection, as opposed to marriage or adoption. Often used in legal, family, or biological contexts.

• 彼かれらは血けつ縁えん関かん係けいにあります。

  They are related by blood.

• 血けつ縁えん関かん係けいのない兄きょう弟だいもいます。

  There are also siblings who are not blood-related.