Membership of languages in a language family is established by
comparative linguistics.
Sister languages are said to have a "genetic" or "genealogical" relationship. The latter term is older,
[2] but has been revived in recent years to better distinguish the
relationships between languages from the
genetic relationships between people. The evidence of linguistic relationship is found in observable shared characteristics that are not attributed to
contact or
borrowing.
Genealogically related languages present shared retentions, that is,
features of the proto-language (or reflexes of such features) that
cannot be explained by chance or
borrowing (
convergence).
Membership in a branch or group within a language family is established
by shared innovations, that is, common features of those languages that
are not found in the common ancestor of the entire family. For example,
Germanic languages are "Germanic" in that they share vocabulary and grammatical features that are not believed to have been present in the
Proto-Indo-European language. These features are believed to be innovations that took place in
Proto-Germanic, a descendant of Proto-Indo-European that was the source of all Germanic languages.
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