What is full of holes but still holds water?

There are six people in a family namely M, N, O, P, Q and R.

R and O are brother and sister.

N is the brother of Q's husband.
P is the father of M and grandfather of R.

How many male members are in the family?

The person who makes it has no need for it; the person who buys it has no use for it. The person who uses it can neither see nor feel it. What is it?

John is asked to stand behind Jacob and Jacob is asked to stand behind John. Both of them feel confused about it and don't know what to do?

But it is quite possible, do you know how?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

A shepherd had 18 sheep, out of which, all but ten died.

Can you tell us how many sheep was he left with?

In a chess board, the queen piece can move horizontally, vertically and diagonally freely. The picture represents the same.Can you place 8 queens on the board in a manner that none of the queens can attack each other?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

This is a classy optical illusion puzzle. What more you can find except bricks in the image below?

A man dies of old age on his 25 birthday. How is this possible?