This paradox is pretty confusing, or is it? The grandfather paradox simply explains that, if we kill our grandfather(before sex), we would simply live on. But wait, what happens to the grandfather? To me, my hypothesis is the grandfather will disappear and another one will appear. But what happens if we didn't kill him, but instead we killed all his sperm? That means we wont exist, that means a new one will appear right. But to my opinion, no. My hypothesis of what probably will happen is the old grandfather will still be living, but another grandfather will be born into the world. Why? Because the grandfather hasn't died so he won't disappear but he also can't make love to our grandmother so we won't be born. Thus, another grandfather will be born into the world. I'm not sure of my opinions and hypothesis because scientists probably have already explained this but I'm just sharing my opinion.