rule prohibiting match-ups between wrestlers from the same family
Sumo term: a rule that prevents wrestlers from the same stable or family from facing each other in tournament matches.
Because of the rule prohibiting match-ups between wrestlers from the same family, sibling wrestlers do not face each other.
Compound of 家族 (family), 別 (by, according to), and 総当り (round-robin). The term is specific to sumo and its exact origin within the sport is uncertain.