What does this rebus puzzle means ?

What demands an answer, but asks no questions

Two fathers and two sons decided to go to a shop and buy some sweets upon reaching. Each of them bought 1 kg of sweet. All of them returned home after some time and found out that they had 3kg of sweets with them.

They did not eat the sweets in the way, nor threw or lose anything. Then, how can this be possible?

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?

Can you convert the number zero(0) into a positive number using just one mathematical operator ?

You can take four of the five letters out of this word, but the pronunciation never changes. What is the word?

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?

You are presented with three boxes. One of them has a red ball inside and the other two have a black ball inside each of them. You are asked to pick up the one with red ball and you pick one. Now, one of the other boxes is opened and it is found to have a black ball.

You are presented with a chance to change your box with the one that is left closed. Will you change your box? Why or why not?

I always drive my customer away.

Who am I?

Find the number of squares in the below-given picture.