“How do I go back and not marry my ex, but still have my kids now?...I guess if I’d shot her when I first wanted to, I’d have been out by now, still had my kids and not her.”
Note to self: Avoid women at altars...
The parallel dimensions might explain ghosts and visions of other times. Their might be natural time travel that need not use Deloreans or Time Tunnels. Their might be many thousands of dimensions —in One Hillary won the election, in another Hitler won WW II (what sort of world would he have made?) One theory holds that Out of Body Trips are only going to a close by dimension. BUT your time trip would not effect your timeline—when you got home nothing would have changed.
When you get married, you enter into an altared state.