Here is Practical Explanation about Next Life, Purpose of Human Life,

[Mister Agenda]

No one can prove there is no after life. That does not mean that there is one, or if there is, that your idea of it is the correct one. The logical fallacy you are making is called an 'argument from ignorance'. It takes the form of asserting that if someone else does not know something, it increases the odds that your assertion on the subject is more likely to be true. It isn't.

You're not necessarily wrong, but if you are right; it is not for the reason you've given.

So Your father existed before your birth. you cannot say that before your birth your father don,t exists.

so next question is how child will understand this thing that who is his real father ? cuz before his birth he/she never seen him. so would he will accept anyone else as his father ? or how child will understand this thing that who is his real father ?

what is your answer ?

That's right, my father existed before my birth.

I can't know for sure my father is my father without a DNA test. My mother either for that matter. It's possible that I'm adopted and they never told me. I accept that they're my real mother and father because it's likely and it doesn't cost me anything to do so, and even if they're not my real mother and father, they have been just like a mother and father to me.