I don't have people that have passed, but I've got people from childhood and / or people that are equivalent of dead to me. Even though they still exist, who they were is non existent and never could exist again, they are effectively someone who also knows who I used to know. I consider the old person dead and the continuation.. someone else. I've seen them in dreams, it's disturbing they're still young, and I've missed so much of who they could have been. Dialogs aren't normally *too* much, because it's painful (the idea I'm talking to someone so far in past).