What does this mathematical rebus means ?

A man says, "Brothers and sisters, have I none, but that man's father is my father's son." Who is that man?

What time is it when an elephant sits on a fence?

Can you find out the remainder when 3^300 is divided by 5?

There was a strange boy who was born before his father. How can this be possible?

Solve below popular number sequence
314 159 265 358 979 323 846 ?

Can you make four (4) nines (9) equal 100?

John went to a parrot shop in Mexico, and the parrot owner told him that his parrot is so unique that he repeats everything he hears. John got excited and immediately bought the parrot. John went home and spoke many words, but the parrot does not repeat anything.
He went again to the parrot shop and complaint to the shopkeeper, but the shopkeeper never lied. Explain?

John can fit six large chocolate boxes or nine small chocolate boxes into a carton. How many cartons will he require to put sixty-six chocolate boxes into?

If you drop me I’m sure to crack, but give me a smile and I’ll always smile back. What am I?