Tlingit is distantly related to the Athabaskan–Eyak group to form the Na-Dene family, also known as "Athabaskan–Eyak–Tlingit" (AET). With Jeff Leer's 2010 advances, the reconstructions of Na-Dene (or Athabascan–Eyak–Tlingit) consonants, this latter grouping is considered by Alaskan linguists to be a well-demonstrated family. Because both Tlingit and Eyak are fairly remote from the Athabaskan languages in terms of their sound systems, comparison is usually done between them and the reconstructed Proto-Athabaskan language. This resembles both Tlingit and Eyak much more than most of the daughter languages in the Athabaskan family.