Re: The Avengers 2! The Official News and Speculation Thread - Upgrade section 5 -
There was never any evidence that Mystique ISN'T Nightcrawler's mother. Singer even had that scene with the two in X2. We know that Alex is related to Scott in SOME way, maybe an OLDER brother or uncle. We also don't know for sure that Sif and Heimdall AREN'T related, they may very well be and it just wasn't stated.