A man becomes father after many years of marriage. And he had the only son..........so he loved his son the most.

When his son got 1 yr old.......he asks wt gift he wants. Son says I want 1 black ball n 1 white ball. He gives.

When his son first time goes to school, he asks wt he wants. Son says only 2 things - 1 black ball n 1 white ball.

When his son got married, he again asks his father to gv only 2 things as wedding gift----1 blck ball n 1 white ball.

One day that father becomes the grandfather, then he asks his son----hey son, now u hv made me grandfather. I m very happy. Wt do u want in gift? He says ---- 1 blck ball n 1 white ball.

Unfortunately, the son was unemployed till this stage. Suddenly, he gets a very gud job. His father was delighted. He didn't ask which gift his son wants. He himself gives him 1 black ball n 1 white ball. The son was very happy.

One day, his son becomes very ill. Doctors told that there is no hope of his survival. Slowly Slowly his last day comes.....His father was very upset. He asked his son whether he had any last wish. Son replies ---- Yes! I want 1 black ball n 1 white ball.

At this stage, father lost his patience. He says -----My dear son, we hv everything with us. I can gv u whtever u want. But stilll, right from ur childhood u asked for only gift...1 black ball n 1 white ball. Now when u r going from this world, u will hv to tell me its reason. His son says.......although I hvn't told anyone its reason, but since I m going from this world now, so I m going to tell u the reason........or u may call it as greatest motive .............and that is.............................................................................................

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Before speaking anything, the son dies.

SORRY