Also incorrect.

What do you think a dialect is.

Mutually intelligible, same root and primary sources, but still a language.

There is differentiation in English, and I haven't even gotten into the creole's or the sub-dialects within each of the main differentiations.

thou and I, my friend, can, in the most flunkey world, make, each of us, one non-flunkey, one hero, if we like: that will be two heroes to begin with. (Carlyle)