The Siangic languages are a small family of possibly Tibeto-Burman languages

Tibeto-Burman languages

The Tibeto-Burman languages are the non-Chinese members of the Sino-Tibetan language family, over 400 of which are spoken thoughout the highlands of southeast Asia, as well as lowland areas in Burma ....

 spoken in Arunachal Pradesh

Arunachal Pradesh

Arunachal Pradesh is a state of India, located in the far northeast. It borders the states of Assam and Nagaland to the south, and shares international borders with Burma in the east, Bhutan in the west, and the People's Republic of China in the north. The majority of the territory is claimed by...

, northeast India (also claimed by China). They are Koro and Milang

Milang language

Milang is a small Tibetan–Burman language of India. It has traditionally been classified as the most divergent of the Tani languages, but Post & Blench reclassified it as Siangic.-References:...

, the latter previously classified as a divergent member of the Tani languages

Tani languages

Tani, Miric, Adi–Galo–Mishing–Nishi , or Abor–Miri–Dafla is a compact family of Tibeto-Burman languages situated at the eastern end of the Himalayas, in an area skirted on four sides by Tibet, Assam, Bhutan, and Burma....

.

The Siangic languages have a large proportion of non-Tibeto-Burman core vocabulary. It is not yet clear whether this is a substrate in an otherwise TB family, shared to a lesser extent with the Tani languages

Tani languages

Tani, Miric, Adi–Galo–Mishing–Nishi , or Abor–Miri–Dafla is a compact family of Tibeto-Burman languages situated at the eastern end of the Himalayas, in an area skirted on four sides by Tibet, Assam, Bhutan, and Burma....

, or whether Siangic is an independent language family that has undergone extensive TB influence.