Its like Billy's brain shorts out and for the second time he's happy he's already sitting down. "You lost him? Like he's dead?" Well that was....that was not at all like his world.

He looks up and Steve and he knows he probably looks shocked. "Wanda is my mother."

It's a simple statement, one that will probably let everything click into place for Steve. There more to the story than that but when it comes down to it Wanda created him, he carried Maximoff genes, she is his mother.