Teach adolescents about parents using the moral or theme that looks to the future. Beyond the fact that they'd probably find it strange that a fashion designer had the same name as that high school student, it's unlikely that they would know Marty.
Even though he was instrumental in bringing them together, "Calvin Klein" fell into the latter category. He was around for almost a week before disappearing completely. Marty's parents happen to cross paths, and we later learn that George goes on to become a well-known author. So he marries Lorraine, although most likely on a different day.
According to the movie, the old Marty just jumps into the shoes of the new Marty after traveling back to 1985. He is unaware of the activities of the new Marty. is essentially a stranger in his own home and is unaware of the family's travels. What are the chances that the new Marty, who has a successful parent, will date the same girl despite her drastically altered appearance and be great friends with Doc Brown? You could spend all day pointing out the errors, so the fact that they forgot about Marty pales in comparison.
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