Thomas gave a stiff nod, understanding the emotion on her face. He hadn't wanted Wanda to know about Cassie. OR about them. There were many reasons for this. At first it was because he was afraid of her. Of what a mother might mean, but now it was different. Call it that Pietro protective syndrome. She wasn't their mother and she didn't deserve that burden. But here they were and here it was. She knew all the bad parts already. The insanity, and the killings. Everything that led up to why they were here. It wasn't fair. Not to Wanda, not to Cassie, and not to Billy.
"You know all the bad stuff. I tried to hide that from you. But now, there's no turning that back. I thought about this afterward and I think it's time you deserved to learn the truth." He said remembering a conversation he'd had with the Vision. The odd artificial life form thing, that was kinda their father, and not at the same time.