> Parents usually teach their children a lot about language. They give them visual cues, speak at varying rates, change their own tone in some situations, and s

> Parents usually teach their children a lot about language. They give them visual cues, speak at varying rates, change their own tone in some situations, and so on. They do, but this training is not necessary for a child to acquire language. Idioglossia (private languages between two people) is an extreme example, but also the process of a pidgin becoming a creole, where the younger generation of a pidgin speaking population fills in the missing details to create a more complete language, even without ever being exposed to such a language.