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.
彼とは血のつながりはないが、本当の兄弟のように感じている。
I'm not related to him by blood, but I feel like he's my real brother.
血のつながりだけが家族の絆ではない。
Blood ties are not the only bonds of family.
血縁 is a more formal, technical term for blood relationship, often used in legal or genealogical contexts. 血のつながり is a common, everyday expression.
親族 refers to relatives in general, including both blood relatives and in-laws. 血のつながり specifically emphasizes the blood connection.
Compound of 血 (ち, 'blood') + の (possessive particle) + つながり (connection, relationship). The reading つながり is the nominalized form of the verb つながる (to be connected).