memories with. >> shep: nancy reagan called you. >> yes. almost immediately. >> it was the first call we had. >> yes. >> and she wanted more to talk to you, lydia, than she want to do talk to charles. >> well, of course. >> why? >> well, i think she felt she had more to give me than she would have to give him. >> she says of her own experience with president reagan, that the hard part is not being able to share memories together and that she gets lonely. did she tell you that? >> she didn't in so many words. i asked her, i said, does he know you? and she said no. and there was a lot in that no. >> shep: the late peter jennings from an abc special. of course, alzheimer's takes many forms and it's impossible for care takers to prepare for