Wanda's voice is as soothing as she can make it, and her hands are raised in a sort of placating/'don't shoot' position.

"It's complicated. I haven't really figured out how or why, but you are my son. You were born out of magic, and your host mother carried you and raised you. I'm so sorry I didn't find you sooner, and that I wasn't there for you. I know it hasn't been easy for you, and I wish I could have helped with that."

She wants to add 'but I'm here now,' but even to Wanda it sounds cheesy.