By that logic, you are basically saying that parents who let their children starve should not be prosecuted.... Are you sure about that?
No of course not, because as I said: there is a moral imperative for parents to care for their children as dependents; our law imposes this duty at present as it has since antiquity. The family is the basis of all human civilization; childrens' rights are proscribed because they lack judgmental and cognitive capacity, and their parents' duty to care for them serves in place until they reach the age of majority. But what truly binds a family together is love, a bond far stronger than duty, but nonetheless a product of the human mind, and not mere animal instinct.