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He lives with his step-mother, Edna. He just calls her "grandma" as an insult. * This is in violation of the first rule of BTTF time travel: you can never see the effects of your own time travels before actually performing those time travels. * The whole premise of Back To The Future Part II is a violation of this rule, because Marty and Jennifer see their children despite, from an external perspective, having just disappeared for 30 years. They should not be able to see their children because they haven't travelled back in time to 1985 yet, nor got old enough to finish school, get married and have those kids in the first place. * No No NO! That only applies if they had opted to stay in the future. * Perhaps the 2015 they visit is the version of history wherein they hadn't, a

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  • Back to The Future/WMG
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  • He lives with his step-mother, Edna. He just calls her "grandma" as an insult. * This is in violation of the first rule of BTTF time travel: you can never see the effects of your own time travels before actually performing those time travels. * The whole premise of Back To The Future Part II is a violation of this rule, because Marty and Jennifer see their children despite, from an external perspective, having just disappeared for 30 years. They should not be able to see their children because they haven't travelled back in time to 1985 yet, nor got old enough to finish school, get married and have those kids in the first place. * No No NO! That only applies if they had opted to stay in the future. * Perhaps the 2015 they visit is the version of history wherein they hadn't, a
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  • He lives with his step-mother, Edna. He just calls her "grandma" as an insult. * This is in violation of the first rule of BTTF time travel: you can never see the effects of your own time travels before actually performing those time travels. * The whole premise of Back To The Future Part II is a violation of this rule, because Marty and Jennifer see their children despite, from an external perspective, having just disappeared for 30 years. They should not be able to see their children because they haven't travelled back in time to 1985 yet, nor got old enough to finish school, get married and have those kids in the first place. * No No NO! That only applies if they had opted to stay in the future. * Perhaps the 2015 they visit is the version of history wherein they hadn't, as teenagers, gone forward in time to 2015. Here's how it works: After surviving the bullets in the new version of 1985 at the end of Part 1, Doc decides to go forward in history. He does completely disappear from the timeline (like the previous point argues that Marty and Jennifer should have) until 2015, and everything else happens "normally" until that point. For example, the car accident that we see not happen at the end of Part 3 does. (Heck, perhaps middle-aged-Marty's psychological problems are also partly related to the trauma of Doc having disappeared.) Doc reads the newspaper article about Marty Jr in jail, and decides he must prevent it. He goes back to 1985 and picks up Jennifer and Marty, then goes forward. This would cause timeline alteration, including a no-Jennifer-and-Marty universe, except that the ripple effect "hasn't happened yet", in accordance with BTTF metaphysics. So they necessarily visit the exact same 2015 as the one from which Doc departed. It is only afterwards that things diverge (with the usual weird risks of paradoxes and whatnot). The same principle seems to hold with old-Biff's adventures — he goes back in time and gives the almanac, which means that when he goes forwards, one would think he would arrive in a rich-Biff timeline, but he doesn't because (his having left 1955 prior to the branching point at which Marty either does or doesn't successfully take the almanac back) the changes haven't propogated forward "yet". Sort of. (He has the heart attack because the rich-Biff ending up dying in middle age.)
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