Re: The Avengers 2! The Official News and Speculation Thread - Part 1
Well it wouldn't be the first time that a marvel franchise has ignore the lineage between characters.
We have yet to have any kind of on-screen confirmation that Mystique is Nightcrawler's mother, let alone that she's Rogue's stepmother (or that Nightcrawler and Rogue are supposed to be like siblings). There has been no reference to the connection between Scott and Alex Summers, or Heimdell and Sif.
So yeah, the lineage thing shouldn't be a issue, especially since I doubt most regular moviegoers would know about it right away or at all.