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According to question, grandpa doesn't believe the predictions of a long, cold winter he relies on the ache in his knees and claims that spring will arrive early this year is True .
When the past is altered in any way and a contradiction results, this is known as the consistency paradox or grandfather paradox. One frequently cited scenario is going back in time to change how one's ancestors were conceived (for instance, by prematurely killing the parent), which would then change how one was conceived. It would not be possible for the time traveler to carry out such an act in the first place if they were not born.
As a result, the ancestor has children who will eventually become the time traveler's next-generation ancestor. Every time it is feasible to change the past, consistency paradoxes arise. One option is that a time traveler can affect anything that already occurred but cannot affect anything else.
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