Riddle #523

Question: A mother is 21 years older than her child. In 6 years the mother will be 5 times older than her baby.

Where is the father?

Question: Where do all the letters sleep?

Question: What tastes better than it smells?

Question: What two things can you never eat for breakfast?

Question: What asks but never answers?

Question: People see through me, but none pass through without killing me. I can be anywhere, and can be seen double or single. What am I?