Welcome, time traveler, to the most epic paradox in the multiverse! You've managed to kill your grandfather before he had kids, preventing your own birth. Congratulations!
But wait, isn't that just a classic case of Predestination?
Or maybe you're just a time-traveling assassin, sent back to eliminate a potential threat to the space-time continuum. Either way, you've got some explaining to do.
Here's the thing: if you never existed, then how can you be here, reading this message? Is this some kind of meta-temporal feedback loop?
Don't worry, we're not judging you. Yet.
But seriously, folks, the paradox is self-sustaining. You can't change the past, but you can change the future. Unless you do, in which case... Time Traveler's Dilemma.