There's no such thing as multiple time lines. There is only one. Multiple timelines like in back to the future are impossible. The idea that you could go back in time and change how the future comes about is not possible. You can change the future, but that change always existed. So you can't go back and change what happened so that something different will happen later in. You can only do something that would cause an effect in later time space and that thing you cause happens in the only timeline that existed.