Question

what is exactly grandfather paradox??

Answer 1

The grandfather paradox is a paradox of time travel in which inconsistencies emerge through changing the past. The name comes from the paradox's common description: a person travels to the past and kills their own grandfather before the conception of their father or mother, which prevents the time traveler's existence.

Answer 2

Grandfathers paradox is :-

There is a child ,his father and the child’s grandfather

The child got the ability to time travel

He time travels and kills his grandfather before he met his grandmother

So this is the conclusion of the paradox ,  SINCE HIS GRANDFATHER WASN’T THERE HIS FATHER WOULDN’T BE THERE WITHOUT HIS FATHER BEING THERE HE WOULDN’T BE THERE WITHOUT HE BEING THERE HE CAN NOT KILL HIS GRANDFATHER SO HIS GRAND FATHER IS ALIVE ………  SO HE IS ALIVE AND SO HE KILLS HIS GRANDFATHER ……………………………

this is a loop and this is the grandfathers paradox