Time travel to the past is 42 Mariano Rivera Mo the Sandman New York a.l 1995 2013 Hall of fame shirt. It may be that we don’t have to worry about the Grandfather Paradox because it simply isn’t possible to travel back in time. In my opinion, this is the most likely solution. Time travel to the past is possible, but as soon as you arrive in the past, you create an alternate timeline that runs parallel to the reality you left. Let’s call that Reality B. If you kill your grandfather in Reality B, it prevents you from being born in Reality B, but it doesn’t cause a paradox because the you that murdered your grandfather came from Reality A.
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For whatever reason, you are only able to observe the past without interacting with 42 Mariano Rivera Mo the Sandman New York a.l 1995 2013 Hall of fame shirt. I’m going to rate this as a tie with the previous solution in terms of plausibility, because both solutions suggest that there is some greater presence in the universe that prevents you from being able to change the timeline as it is written. And I’m not necessarily talking about God, because God seems to be big on the concept of free will, and how can free will exist in a universe whose complete history is already written? I think the most likely solution to the Grandfather Paradox is the first one I stated: time travel into the past is not possible. But who knows? If you’re writing a science-fiction story, you can use any one of these solutions, or something even weirder.