Good Riddles

Question: There was a family who lived in a circle house, one day they went on vacation but they left their little boy behind. When they came back they found their little boy dead in the middle of the house. They narrowed it down to three suspects: The maid, the butler, and the chef. The maid claims she was cleaning the corners, the butler claims he was organizing the closet, and the chef claims he was making finger sandwiches.

Who killed the little boy?

Question: If a pirate was to join the military, what branch of the armed service would they probably go in to?

Question: It smells like blue paint,
pours like green paint,
and it looks like a red truck.

What is it?

Question: Enter one hole and leave three,
once you succeed I'm on thee?

What am I?

Question: I am in everything and in nothing, what am I?