Jural itself means "of or pertaining to rights and duties". Therefore, a jural rule is a specification of the rights and duties entailed by occupying a specified social position or by having a specified social status. Jural rules certainly do regulate or govern social action or conduct, and they do that by specifying the rights and duties of persons or of sets of persons vis-a-vis one another. If membership itself is a matter of little or no jural significance, as it could turn out to be in that kind of social context, there will be few if any rights and duties even between those persons of common descent who happen to be also co-members of a group. That is, relations of agnatic or uterine kinship, or of common patrilineal or matrilineal descent, would have no jural significance even if only within groups.