Kurt probably could have guessed. If Raven wasn't with the Professor, then that likely meant she was with Magneto. There weren't many mutants who took the 'middle ground,' so to speak. But he didn't bring that up yet, just nodded when she explained his father. "What about you?" he asked, looking up with wide eyes. "Who...are you? I mean, I just...I guess I just want to know all about you."
He wasn't sure how he felt about all of this, especially meeting his mother here in 1964, but he didn't want to run away from her. Who knew when he would ever see her again?