[quote=benmer007;31844]he comes back to a world where his father hadnt die yet.

you just might have something there, what is going to change? If they are living in a time gap on the island, when they get back is it going to be future or past. What if time was running backward on the island? Then maybe jack can save his father. Is there a possibility they could come back from the island and be in a parallel dimension to ours something that is almost like the world they left, but just a little off. i.e. jack's dad has never touched a sip of alchohol.