"I remember." And he remembers the look on Jack's face the night she died, too.
It's tempting to ask more, to find out how many people he's loved over the years, how many children he's had, how many of them he's buried. But he's not sure he really wants to now. What they have now seems more important than his past. He'll hear what Jack wants to share, but he doesn't need to ask about the details of every single photo.