noun
consanguinity; blood relationship
Refers to a relationship by blood or common ancestry. Often used in legal, anthropological, or formal contexts.
同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.
血縁 also means blood relationship but is more common in everyday and legal contexts. 同族関係 is more formal and often used in anthropological or sociological discussions.
Compound of 同族 (same family/clan) and 関係 (relationship). The exact historical derivation is uncertain, but the term is conventionally associated with blood ties.