The Eskaleut (Eskimo-Aleut/Inuit-Yupik-Unangan) family splits into two branches: Aleut (Aleutian and Pribilof Islands) and Eskimoan, the latter further dividing into Yupik languages (western/southwestern Alaska, Chukotka), Inuit languages (northern Alaska, Canada, Greenland), and the extinct Sirenik.
Inuit languages form the eastern branch of Eskimoan, roughly 100,000 speakers, spoken across northern Alaska, Canada, and Greenland as a dialect continuum (neighboring varieties mutually intelligible, distant ones increasingly divergent).
The proto-language is estimated to have split into Eskimoan and Aleut branches at least 4,000 years ago, with Eskimoan itself splitting into Yupik and Inuit roughly 1,000 years ago.