About the Indo-European family of languages, a common hypothesis is that it originated in central Asia, somewhere north of the Caspian and/or Black Seas.
Do we have any idea where the Sino-Tibetan family of languages originated, or at least of the Chinese branch of this family?
I believe most of the oldest Chinese prehistoric remains are scattered along or around the valley of the Yellow River. Is that also where it is hypothesised that the oldest forms of the language originated, and/or the oldest place where its Sino-Tibetan ancestral speakers dwelled?