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At the end of Back to the Future, Part III, Marty declines to enter the drag race that was shown in the previous film to have disastrous consequences for his musical career. The 2015 fax of future-Marty being fired is now blank, implying that the future of the McFlys shown in Part II no longer exists. So, did Marty just erase his two children from the timeline?

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He erased his continued existence of doing stupid things for Needles (which got him fired). Since he still hooks up with Jennifer, it seems likely they would still have kids. – Jack B Nimble Mar 14 at 14:58
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Would Jennifer want to have kids after seeing idiot Marty Jr. and that Marlene looks like Marty too? Her whole future experience would encourage the use of birth control. – Hannover Fist Mar 14 at 17:43
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The movie never says specifically, but it may have been mentioned in the animated series. Marty declines to race against Needles, which did change the future. Marty and Jennifer's future did change after this event, but this was for the better.

Marty's involvement in the race had very negative consequences to his future life. He breaks his arm, and gives up his possible music career. In the events in BTTF 2, Marty and Jennifer were not very happy, or successful people. Many of his ills came directly from the race. Their kids were trouble makers, they had financial issues, etc. Marty and Jennifer also were married at the Chapel O' Love instead of having a big wedding.

It is likely that Marty and Jennifer did get married, and still have children just like his parents did. In the first BTTF, Marty's parents met in a different way, and went on to be far more successful than they did before the past was changed. Even with all of these changes, all three of their children were still born. We could expect a similar outcome with Marty's and Jennifer's children.

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This is the solution that I was leaning towards when I wrote the question. The devil in me, though, wants them to be eradicated. >:) – John Sensebe Mar 14 at 16:25

Unclear, but unlikely.

The drag race (and its negative repercussions) are something that wouldn't have an immediate impact on Marty's relationship with Jennifer. Apparently even in the "crapsack" timeline she still lives with him and has his kids. There's no good reason to assume that in the "good" timeline this wouldn't also be the case.

The BTTF FAQ offers the following advice about timelines. Unless you do something really drastic, changing time isn't all that easy. Small events are simply glossed over in the "river of time"

There's a theory (we like to call it the "Self-Preservation Instinct of the Space-Time Continuum Theory") that says that the continuum is always trying to keep itself "on course," and when things happen to change it, it always tries to correct itself. It is much like a river, which tries to keep its overall course. Although earthquakes, fallen trees, floods, or other circumstances might disrupt it at points, the river would cut a new channel so that it would end up back at the same place. Thus, the overall physics (or metaphysics) of the space-time continuum would insure that any of Doc's memories of events that might create paradoxes would become hazy — or be erased.

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That seems to be the operating theory in the current series The Flash too (but interestingly, not in Legends of Tomorrow). I'm more of a paradox denier myself. Either you can't change what already happened, or (more likely) its impossible to go back. Oddly, Bill&Ted handled this really well. – T.E.D. Mar 14 at 16:09
    
@T.E.D.: Have you seen the Pathfinder trilogy by Orson Scott Card? He has a different idea of "paradox denying" based on the idea that our concept of paradox comes from incorrectly conflating time and causality, and it makes for a very interesting time-travel story. – Mason Wheeler Mar 14 at 18:19
    
@MasonWheeler - Not typically a Card fan, and Time Travel is right up there with self-reinforcing expansion ("Zombie Apocalypse") as my least favorite SF story mechanics, but I'll put it on my list of stuff to check out. When I see either, I never expect much, so occasionally I'm pleasantly surprised. – T.E.D. Mar 14 at 18:48
    
@T.E.D. The basic concept he uses for these stories is, "there's no such thing as temporal paradox. Whatever influenced me up to this point is already in my causality chain, and if I go back in time and change that, it doesn't change my causality chain because causality and time are not the same thing. Therefore, killing my grandfather before my father is born cannot cause me to cease to exist." When you take the age-old hackneyed time travel drama-generating trope of paradox out of the picture, you're able to do all sorts if fresh and interesting things with the concept of time travel. :) – Mason Wheeler Mar 14 at 21:01

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