noun
collateral blood relative
Legal and genealogical term for blood relatives who are not in a direct line of descent, such as siblings, aunts, uncles, nieces, and nephews. Contrasts with 直系血族 (lineal blood relatives).
民法では、傍系血族の範囲が定められている。
The Civil Code defines the scope of collateral blood relatives.
兄弟姉妹は
Siblings are considered collateral blood relatives.