Answer:
David's father has three sons: Snap Crackle and ?
I contain six letters minus one and you got twelve.
I can generate fear and some say I come out of your ears. I am as quiet as a mouse but not welcomed in the house.
I am a box which holds keys but not locks. With the right combination, I may unlock your soul. What am I?
I am all around yet to me you are half blind. Sunlight makes me invisible and difficult to find.
It flows out of the soil, It burns you if it boils, And holds us in its coils, More valuable than gold, As black as it is old.