民法では六親等内の血族を親族と定めている。
The Civil Code defines blood relatives within the sixth degree as legal relatives.
彼には頼れる血族が一人もいなかった。
He did not have a single blood relative he could rely on.
養子は養親の血族と法律上の親族関係を持つ。
An adopted child has a legal family relationship with the adoptive parent's blood relatives.
その一族は血族の結束が非常に強い。
That clan has very strong solidarity among its blood relations.