Siouan languages
Siouan languages can be grouped into the Western Siouan languages and Catawban languages. The Western Siouan languages can be divided into Missouri River languages (such as Crow and Hidatsa), Mandan, Mississippi River languages (such as Dakotan, Chiwere-Winnebago, and Dhegihan languages), and Ohio Valley Siouan branches. The Catawban languages consist only of Catawban and Woccon.
Austroasiatic languages
This is identical to earlier reconstructions except for . is better preserved in the Katuic languages, which Sidwell has specialized in. Sidwell (2011) suggests that the likely homeland of Austroasiatic is the middle Mekong, in the area of the Bahnaric and Katuic languages (approximately where modern Laos, Thailand, and Cambodia come together), and that the family is not as old as frequently assumed, dating to perhaps 2000 BCE. Peiros (2011) criticized Sidwell's theory heavily and calls it a bunch of contradictions. He show with his analysis that the homeland of Austroasiatic is somewhere near the Yangtze. He suggests the Sichuan Basin as likely homeland of proto-Austroasiatic before they migrated to other parts of central and southern China and than into Southeast Asia. He further suggests that the family must be as old as proto-Austronesian and proto-Sinotibetan or even older.