She, Magneto, and Quicksilver, are all shocked when the spell only works on Quicksilver, NOT Magneto! So obviously, Magneto is NOT their father. And, SOMEHOW, despite multiple instances where this ...

The big payoff scene is when we see Quicksilver racing around a room filled with armed forces to prevent an onslaught of bullets from hitting Wolverine, Magneto, and Professor Xavier. It's great.