None of the languages have their own static existence. Just like a river doesn't have a precise start location and end location, a language doesn't have a precise boundary in space and time. More so in time. Language can't be separated from culture, people and place. All of these - language, culture, people, and places change massively over time, to the extent of losing identity.

If English doesn't exist on its own, French doesn't either. Nor does Latin, Greek or Sanskrit. All of these are incremental variations or dialects of some other language.