The five Apache languages are Apachean languages, which in turn belong to the Athabaskan branch of the Eyak-Athabaskan language family. All Apache languages are endangered. Lipan is reported extinct. The Southern Athabascan branch was defined by Harry Hoijer primarily according to its merger of stem-initial consonants of the Proto-Athabascan series *k̯ and *c into *c (in addition to the widespread merger of *č and *čʷ into *č also found in many Northern Athabascan languages).
(Courtesy of Apache Language Wikipedia)