While some languages are relatively 'new' $($e$.$g$.$ some creole languages and some signed languages$),$ when we consider most languages, what is the historical relationship among the languages of the world?

Language families are generally organized by continent; e$.$g$.$ all the traditional languages of Europe are related to each other, but not to any other language outside of Europe.

All$/$most languages can be divided into one of two unrelated groups.

It is true that all$/$most languages are historically related.

It is not true that all$/$most languages are ultimately related to each other.