blood relation

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An exaggeration is a blood relation to falsehood and nearly as blamable.
誇張是謊言的血親，應同樣受到責備。
The Indian organ transplantation rules bar government hospitals from conducting kidney transplants if the donor has no blood relation to the patient.
器官移植法禁止政府毉院爲沒血緣關系人士移植腎髒。
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Attack of the Clones conclusively establishes that these two characters have no blood relation, and thus Obi-Wan's brother is an as yet unexplored character.
《尅隆人的進攻》最後確定這兩個人物沒有血緣關系，這樣，歐比-萬的兄弟仍是一個尚未發掘的人物。

And there was another group that said, no, it should be somebody - a blood relation of the prophet.
NPR: Early Divisions at Root of Sunni-Shia Conflict
It also found little relation between doctor supply and the odds of getting basic tests for cholesterol or blood sugar and and eye tests in diabetics.
FORBES: Are Doctors Too Disorganized?

A blood relation or blood relative is someone who is related to you by birth rather than by marriage.