blood relative; kin by blood
Refers to relatives connected by blood, as opposed to in-laws (姻族). Often used in legal, genealogical, or formal contexts.
See also: 姻族
Blood relatives and relatives by marriage are treated differently under the law.
He is a distant blood relative.
collateral blood relative
lineal relative; direct lineal ancestor or descendant
consanguineous marriage
consanguinity; blood relationship
Compound of 血 (blood) and 族 (tribe, family), literally 'blood family'.