The “Grand Father” paradox is flawed. The time travel cliché of the “Grand Father” paradox is logically flawed and has driven the notion of the multiverse theory. In fact matter as information can be proven to be persistent through time travel and indifferent to events that created it. The fact that a woman and man spawn a child is a form of instancing an object, albeit to the degree of abstraction of a human being is more of instancing a configuration of matter, none the less the information stands on its own within the universe. If such a child where to travel to the past and kill his grand father preventing his birth it would not destroy the information that structures the child. You could find this analogous to a virus that persists in a computer memory. If the computer memory is never purged and the operating system is replaced and all executables that created the virus destroyed but the virus itself is in the memory and never touched then when the operating system is started again the virus still persists. In a similar fashion the child is never destroyed by the child going back in time and killing his grand father. What does happen is the child is preserved in the changed time line even though it is never born. So why do experts need a parallel universe to solve this paradox?