Good Riddles

Question: A man in prison has a visitor. Afterward a guard asks the inmate who the visitor was to him. The inmate replies: "brothers and sisters I have none, but that man's father is my father's son." Who was the visitor to the inmate?

Question: I'm red, blue, purple and green.
No one can reach me, not even the queen.

What am I?

Question: Different lights make me strange,
for each one my size will change.

What am I?

Question: Can you think of a crime that is punishable if attempted but not punishable is actually committed?

Question: A man is twenty years old but has only had five birthdays. How is that possible?