Re: the TIMELINE thread
Scott and Havok aren't officially related in the movie verse. And Scott, Jean and Storm could still have been some of his first students. He didn't say first, he 'some of the first'. There may not have been any new classes between FC and whenever Scott etc became students so they would have been some of the first even if 30 years past in between.
They couldn't have been students anywhere near 1973. And the easter egg unconfirmed cameos in FC don't contradict that. We have no idea that is who those children actually were as they weren't named. Therefore the continuity and timeline still fit for the characters and the OT.