blood relation; kin
Refers to a person related by blood, as opposed to in-laws or step-relations. Often used in contexts emphasizing biological ties.
彼は私の血続きの兄です。
He is my blood-related older brother.
血
Blood-related family is important.
Compound of 血 (chi, 'blood') and 続き (tsuzuki, 'continuation'), literally meaning 'blood continuation' or 'blood connection'.