I've acknowledged that I left out other dimensions and that I think there is a bit of a case for parallel universes. If I were close minded, would those things be true?
So I'll give you this:. At the absolute most; in a highly unlikely scenario, there could be an Earth twin,triplet or quadruplets out there, but if so they are are as inconsequential as a tree falling in the woods with no one there to hear it. It is pointless to look for such a thing and any thought about it has been proven to be a wasted thought. There is a very high likelihood that if even a very few of these actually existed, we would already know.