noun
consanguinity; blood relationship
Formal or legal term for a relationship by blood, as opposed to marriage or adoption. Often used in legal, anthropological, or genealogical contexts.
血族関係にある者同士の結婚は法律で禁止されている場合がある。
Marriage between people who are related by blood is sometimes prohibited by law.
この書類では、血族関係の有無を明記してください。
Please clearly indicate the presence or absence of a blood relationship on this document.
親族 is a broader term for relatives, including both blood relatives and relatives by marriage or adoption, while 血族関係 specifically refers to a blood relationship.
血縁 also means blood relationship, but is more commonly used in everyday contexts and can refer to the bond itself, whereas 血族関係 is more formal and often used in legal or official settings.
Compound of 血族 (blood relative) and 関係 (relationship).