father-son

The compound "father-son" is a modern English construct that directly combines two of the most fundamental kinship terms. Both constituent words have ancient, stable lineages tracing back to Proto-Indo-European, where their core meanings of male parent and male child were already established. The hyphenated form functions as a fixed attributive adjective, creating a conceptual unit that describes the specific relationship or dynamic between the two individuals. This compounding logic is a productive feature of English, allowing for the efficient creation of precise relational descriptors.

This is a compound adjective formed from two simplex nouns, "father" and "son". "Father" originates from Old English fæder, from Proto-Germanic fadēr, from Proto-Indo-European ph₂tḗr. "Son" originates from Old English sunu, from Proto-Germanic sunuz, from Proto-Indo-European suHnús.