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15 year old time-traveller creates account in 2003 and bumps uglies with grandma before returning to 2024 or something.

Re-reading that, a 15 yo travel back in time to have sex with his grandmother so she can give birth to a son the will have a son and this son will be old enough in 2024 to travel back in time in 2009 and impregnate his grandmother ? He biologically couldn't originally come from 2024, his father hasn't had time to develop the ability to reproduce.

Or anyone is time travelling and your explanation is basically just magic.

Definitely Alabama vibe though :].

In my story one can assume that "bumping uglies with gamgam" and "registered a gmail account in 2003" occurred on separate time-trips. If we want to make a book out of it we could do the whole "I didn't know she was gamgam!" meets "Wish I was one of the first!" Time travel trope collision.

My agent will call your agent about the movie rights. I think we can safely leave the final twist details to JJ Abrams.

A predestination rewatch has been on my mind for some weeks now, I know how I'll spend the evening :].

Oh, I thought you were going for an Alabama joke with people marrying their in-laws and becoming their own grandfather, not time travel.

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