Post #16 : Riddle

This person is a caretaker since the beginning of time,
It was said that the Emperor of China has the same caretaker,
Though this person is a servant of the house and responsible for all the housework,
But this person is also a teacher that the whole family respect,
When this person is alive, the whole world is secure,
When this person dies, the whole world would be flooded.

Can you guess who is this person?