血ちのつながり

expression, noun

blood relationship; blood ties

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

• 彼かれとは血ちのつながりはないが、本ほん当とうの兄きょう弟だいのように感かんじている。

  I'm not related to him by blood, but I feel like he's my real brother.

• 血ちのつながりだけが家か族ぞくの絆きずなではない。

  Blood ties are not the only bonds of family.