"She put it onto herself. She just doesn't remember it."

And, to him, that makes no difference. Because family is forever, and that logically needs to apply backwards just as much as it does for present and future.

"But I can wait until she stops being silly and lets me help her with the memory." Sometimes people just need time with learning how to not be silly, and he does his best to be patient then even when it hurts. He's never needed to wait for someone to not deny that they are his family anymore, but he is sure that he will be able to manage that, too.