Answer:
David's father has three sons: Snap Crackle and ?
I am what brings things together. Without me everything you see would be a total mass or debris everywhere. What am I?
I sit in a corner while travelling around the world.
I am full of holes but still hold water. What am I?
You can see me in water, but I never get wet. What am I?
What an fill a room but takes up no space?