This is the story of a man who went back in time and killed his own grandfather before he had children.
But then he had children with his mother, who was actually just a time-traveling clone of his grandmother.
Confused? That's just a Tuesday.
Read the Grandmother Paradox 2: The Clone Edition Read the Grandfather Paradox 3: The Time Loop Edition Read the Quantum Fluctuations 101: A Guide to Time Traveling for Beginners