Good Riddles

Question: 100 feet in the air, yet its back is on the ground.

What is it?

Question: Everyone has me but nobody can lose me.What am I?

Question: A king, queen, and two twins all lay in a large room.

How are there no adults in the room?

Question: A man and his son are in a terrible accident and are rushed to the hospital in critical care. The doctor looks at the boy and exclaims "I can't operate on this boy, he's my son!" How could this be?

Question: Timmy's mother has three children. The first was named April. The next was named May.

What is the final one's name?