And here's the kicker: You could also be the sole reason that everything ended up the way it did. Maybe you were planning to kill Hitler, but missed and instead killed an assassin trying to kill Hitler, making you the reason the Holocaust happened?
This is this:
Well, actually, just the fact that you were able to time-travel proves he could not have been related to you OR (and that is way more likely) you were only conceived because you bumped your own great-great-great-great-great-grandfather and thusly triggered the exact genetic chain that allowed you to time-travel in the first place.
Time-traveller rule #1 (revised): Bump whoever you like. It's only time travel.
The philosophy I subscribe to is this exact one. Otherwise put: If you try to change history through time travel, you will inevitable fail - you already have failed.
Aha!
Now here is where it gets really interesting...
You've accepted the fact that the past is the past and that no amount of trying to meddle with it will change it. It will only cause what we know has already happened.
Now let me expand this to the fact that today is tomorrow's past, I'll let that one sink in for a few seconds...
So, today being tomorrow's past, today is as fixed for a time traveler coming from the future as yesterday is to us living in (what we call) the present.
In a sense, today has already happened (to someone from the future) and nothing you can say or do will change anything about the way it has happened.
So free will is really just an illusion, you can read this, stop doing what you are doing and that's exactly what's supposed to happen.
Expanding on this idea even further, we can see that time in its entirety is just an illusion, everything from the start of time to the end of time has already happened and is set in stone...
What is a psychic then? Just someone who remembers in the wrong direction.
Which brings me to the following card:
Is the Fortune Teller telling the future to the butterfly or is the butterfly telling the future to the Fortune Teller?