As for the third factor influencing the terms of address—_i.e._, the social relationship which exists between the addresser and the one addressed,—it is obvious that different designations are applied to enemies and friends, to strangers and members of the family-circle, nay, generally, to persons to whom one stands in an altogether different external relationship. The importance of this factor is evident from several statements. Thus, among the Hovas, according to Mr. Sibree, the words for brother and sister “are also used widely for any person whom one meets and desires to act towards in a friendly manner.”[498] The Fuegians says Mr. Bridges, form certain kinds of friendships, and “speak of aunts, uncles, brothers, sisters, cousins, nieces and nephews, &c., which are only so through the friendships established.”[499] Among the Waguha, strangers are called “ndugu,” brother, if of the same tribe;[500] and Mr. Hartshorne tells us that the Veddahs applied to him the term “hura,” or cousin.[501] We can understand, then, why the same name, as a rule, is used by the savage to denote just the persons of the same sex and of like age who belong to his own family-circle; and why, as a consequence, the nomenclature is rich or poor according as that circle is small or large. The Yahgans, for instance, who live in families rather than in tribes, have a very definite list of terms for kinsfolk. They have different appellations for nephews and nieces on the brother’s side, and nephews and nieces on the sister’s side, and their words for uncle and aunt differ according as this relationship is paternal or maternal. They have also special terms for father-, mother-, son-and daughter-, brother-and sister-in-law.[502] On the other hand, the larger, the body of kinsfolk that keep closely together, and the less it is differentiated, as regards the functions of its various members, the more comprehensive are generally the terms of address. The “classificatory system of relationship” must, therefore, have emerged at a time when the separate families had already united in larger bodies.
The same principle explains how it happens that a maternal uncle is almost always distinguished from a father by a separate term, whilst this is not the case with an uncle on the father’s side, the former generally living in another community from his nephew, and, besides, very frequently standing to him in a quite peculiar relationship through the rules of succession. It may be fairly assumed, too, that a mother’s sister much oftener than a father’s sister is called a mother, because sisters, among savages, keep as a rule, far more closely together, when married, than brothers and sisters; sometimes even, especially among the North American Indians, they are the wives of the same man. If we add to this that a father’s brother’s son and a mother’s sister’s son are more commonly addressed as brothers than as father’s sister’s son and a mother’s brother’s son, it becomes obvious to how great an extent the nomenclature is influenced by external relations. But as a certain kind of external relationship is invariably connected with a certain degree, or certain degrees, of blood-relationship, the designations given with reference to the former have been taken as terms for the latter.