Bingowings said:
It is unlikely that, especially with such a character change in his parents they would have sex on the same nights and the same sperms would hit the same eggs and have the same success.
They would almost certainly have different sex and different children.
That is one of the things about BTTF that irks me. IMO, the actors who played David and Linda should have been given some makeovers to give their characters different looks in the second timeline.
Also does this mean that 'their' spoiled rich kid Marty is having a divergent universe set of adventures where he accidentally turns his successful parents into a drunk and a coward???
That would have been nice.