Good Riddles

Question: When is a door not a door?

Question: Only one color, but not one size, Stuck at the bottom, yet easily flies, Present in sun, but not in rain, Doing no harm, and feeling no pain. What am I?

Question: What flies without wings?

Question: At night they come without being fetched, and by day they are lost without being stolen.

What are they?

Question: There are 2 fathers and 2 sons going on a fishing trip. Every person catches one fish. In total, there were only 3 fish. How is that so?