Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?

How old is your son? asked a man to his neighbour. My son is five times as old as my daughter and my wife is five times as old as my son. I am twice as old as my wife whereas my grandmother, who is celebrating her eighty-first birthday is as old as all of us put together.

How old is the man's son ?

They do not possess flesh or feathers or scales or bone
But still, they are blessed with fingers and thumbs of their own.

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?

You knock a Table over in the library, and suddenly 20 eyes are looking at you.

He digs out tiny caves and stores gold and silver in them. He also built bridges of silver and made crowns of gold. They are the smallest you could imagine. Sooner or later everybody needs his help, yet many people are afraid to let him help them. Who is he?

You have a basket containing ten apples. You have ten friends, who each desire an apple. You give each of your friends one apple.
Now all your friends have one apple each, yet there is an apple remaining in the basket.
How?

Prove that twice of ten is the same as twice of eleven.

Is the statement valid that it does not matter how much older a sibling is, eventually the younger one will be half as old as the older one?

I am the beginning of everything, the end of everywhere. I'm the beginning of eternity, the end of time and space. What am I?