Khoisan languages
Khoisan languages is the name for a group of languages that are spoken in Southern Africa. All of these lanhuages have click consonants, and theiy are not part of the Niger–Congo languages, the Nilo-Saharan languages, or the Afroasiatic languages.  These languages are not in one common language family, there are at least three such famililes. There are also some language isolates on the territrory where Khoisan languages can be found. As outlined, it is not possible to construct or find a language, that is the common ancestor of the other languages.