What about languages we can only speculate about? E.g: the several languages of the Khoe-Sān people in South Africa.
It is generally assumed that their language is, phonetically, the most "different" in the world and therefore we can suppose that it was one of the first to derive from the hypothetical "proto-language".
It is generally assumed that their language is, phonetically, the most "different" in the world and therefore we can suppose that it was one of the first to derive from the hypothetical "proto-language".