Let us use Coca-Cola company as example. Let us say that the Coca-Cola company is the cryptocurrency, coke is bitcoin while other Coca-Cola products are altcoin. If coke is banned, the Coca-Cola company sales will drop drastically even if other drinks are available. Coke is the mother and face of Coca-Cola, but if coke is banned, it will not affect the peak milk company because they are not related.
Bitcoin is the mother and father of cryptocurrency, if the parents didn't provide food, both the parents and the children will starve.