She didn't need to know what he knew. Peter didn't know — and even Erik didn't know, not for certain. He had his suspicions, but he hadn't pursued it or asked any questions, and the last thing he wanted to do was confuse or upset the young woman in front of him.
But Billy had said something about Erik's daughter, a woman he called the Scarlet Witch. They were universes apart, but somehow all connected. Somehow they were all brought together into something resembling a family.
"It's ... curiosity, nothing more. I may have met your brother, or my world's version of him. He did something important for me."