I was talking to a buddy yesterday, now the conversation went from the summer to girls and back summer and then red dead redemption. And then some how we began arguing about how Jhon is not the father of Jack Marston, I looked online and have seen that this is a popular theory. Even if Jhon is not Jacks Father they have been together and have bonded in such a way that even if Jhon is not the biological Father they have bonded in such a way that he is a father to jack no matter what.