There are 2 possibilities after this situation (as per Indian movies)
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You will find the real father, apnee BV ka hath uss k hath main thama ker, you will lay down on train track and will be squashed by Delhi-Express
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You wills tart treating your kid and wife very badly …so much that they will commit suicide leaving you a letter that will bring ganga-jamna of tears in your eyes. Letter will state something to the effect that you are a stupid guy that you never asked your wife about the kid. Kid was not actually your wifes but it was of wife’s lost sister etc …
pick one !