Stiles didn't expect her to say the right thing, because he'd learned in the years since his mother's death that there was no right thing. Nothing could make him stop missing her, nothing could bring her back. There just...wasn't anything to say. And really, that was the right thing to say. Nothing.
He took her hand tightly and squeezed it. She really couldn't have said anything better, and he hoped that he could make her feel the same way.