Geographical Variation of Systems of Sibling Terms in Asia and Africa

This paper provides an overview of geographical variation of sibling term systems used in Asia and Africa, which are categorized based on distinctions of (1) relative age, (2) sex, and (3) relative sex. Experts in languages/language groups of Asia and Africa have analyzed and mapped these systems; using their findings, I created summative maps showing the geographical distributions of the system types based on rates (percentages) of each type. Type A (undifferentiated sibling type) is conspicuous in Africa. Type B (relative age type) is used in many languages in Africa and Southeast Asia. Type C (skewed age type) commands an absolute majority in languages of Northeast Asia and is also found in Southeast Asia. The change of Type A > Type B > Type C is inferred from these systems’ distributions. Type D (age/sex type) is the only type in Sinitic, and has affected neighboring languages. Type E (brother/sister type) holds the vast majority in Semitic and South Asian languages and has affected surrounding languages. Type F (relative sex type) and its variations are found in peripheral languages in Asia and Africa; this might be the oldest type. This interpretation is supported by attested changes in Japonic.