Answer:
David's father has three sons: Snap Crackle and ?
Against the sun I protect your eyes and am often worn on the face of spies
I am made of wood but can't be sawed? What am I?
Crooked as a rainbow and slick as a plate ten thousand horses can't pull me straight.
I'm sometimes white but most often I'm black. I take you there but never bring you back.
A little house full of meat, no door to go in and eat.