We don't: it violates encapsulation.
It is fine to say, "No, I don't want my own behavior - I want my parent's behavior" because it's assumed that you'll only do so when it maintains your own state correctly.
However, you can't bypass your parent's behavior - that would stop it from enforcing its own consistency. If the parent class wants to allow you to call the grandparent method directly, it can expose that via a separate method... but that's up to the parent class.
Workaround using flag: