Good Riddles

Question: A dad and his four boys stand in line.
All crowned, they toil in darkness.
Another family they see, two birds of a feather.
All of them together clad in leather.

What are they?

Question: What is thrown to both kings and beggars?

Question: It is able, but not capable.
It can stop, but not go.
It is dead, but not yet perished.
It's a ghost, but not paranormal.

Is it high, or is it low?

Question: I only point in one direction,
but I guide people around the world.

What am I?

Question: This sentence is false.

Is the preceding sentence true or false?