The Role of parents is important is the early stage of development because parents are there to teach and help the child learn and advance in life
In childhood for many organisms, there is a "critical period," which is when important learning of certain skills occurs.
The critical period of language learning is a period in the first few years that is crucial for learning a language (language acquisition). After this period, it becomes harder and harder to learn a new language. This is why some immigrants that immigrate later in their lifetime struggle to completely grasp a new language.