Pam Dawber remembers 'My Sister Sam' co-star Rebecca Schaeffer: Part 2

"She became my little sister," Dawber told ABC News. The two actresses lived together for a while, as Dawber watched Schaeffer grow up on the Hollywood scene.
8:06 | 04/13/19

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Transcript for Pam Dawber remembers 'My Sister Sam' co-star Rebecca Schaeffer: Part 2
������ Pam Dawber by the mid-80s was a household name. She starred opposite robin Williams in "Mork and Mindy," which was a massive hit in the late-'70s, early-'80s. Who are you? I am Mork from Mork. Nanu nanu. In addition to her sitcom fame, Pam Dawber was dating mark Harmon, who she would go on to he was on a show called "St. Elsewhere" playing a doctor. He was "People" magazine's sexiest man alive in 1986. They were primetime television royalty. In 1986, Pam Dawber was in the market with a new -- a new sitcom that was eventually going to be called "My sister Sam." And Pam Dawber needed a kid sister to play opposite her. We searched and searched and search for that Patti character. And then, at the end, we became so desperate because we just weren't finding the right person. When Rebecca came in, it was just clear she was the one. Hi, I'm Patti russel and this is my sister Sam. I just moved in. We haven't lived together since we were kids. I was raised by our aunt and uncle. Things sure have changed. I used to dress her. I can't wear this out in public! This makes up for the haircut you gave me when I was 3. The set up for "My sister Sam" was pretty classic '80s stuff. Pam Dawber is a freelance photographer living in San Francisco. Very successful. ��� Everything starts like a knock at the door ��� ��� you don't know what it is but you know who it's for ��� her younger sister then comes to live with her because their parents have died. So it becomes a, kind of, story of generational conflict. Patti, I'm just doing what I really think is the best thing for you. Oh, don't say that. What? I'm only doing what's best for the child. Patti russel is hyper, smart, 16 and, um, kind of -- she wants to be different, but she wants to fit in like any normal teenager. We just hit it off. She just had a very natural quality. And plus, she just was so cute. She was a kid. She was a kid. She was 18. And I moved her into my house because she didn't have anywhere to stay, really. She was new to Hollywood, and R parents were not with her. So she became a kind of parent. So you were roomates? So we were roommates. I drove her car. I ate her food. I, you know, raided her ice box for ice cream. She was great. I thought it waa good idea because she and I would become familiar with each other, and she was very open to it. So she became my little sister for a few months. Yeah. It makes a difference, you know, when you have a strong relationship off camera, obviously on camera. It's gonna do wonders. You know, the show is dated it was in the '80s after all. But our stuff, the stuff that Rebecca and I did together, that was good stuff 'cause it was real. Here we go. Rate your mate. You don't have a mate. They were great together. Pam was fine being the uptight, stiff one, and Rebecca was great playing the rebellious teenager. It was a family show. At the heart of that family was Rebecca Schaeffer because everyone wants her as a sister. It was a real natural talent. There was a chemistry between all of us. Everybody was part of everybody's life. It was the most amazing experience for her to have, for Rebecca to have as a first time. We were a hit show. But we were sandwiched between "Kate and Allie" and "The Bob Newhart show." And so, we got good ratings. Once she was on that show, obviously, there was a fair amount of attention connected to her. "Seventeen" magazine. It'd be like being on the cover of "Vogue." You know, for a young girl to be on the cover of "Seventeen," it was a very special thing. She and Pam Dawber were on the cover of "TV guide." "TV guide" had 40 million readers a week. It was the number one magazine in America. When you're popular enough, the "TV guide" wants to put you on the cover. These are the golden moments that don't happen very often. And so for Rebecca, I was thrilled. And it didn't really phase her. It was just like another day. Did not go to her head, at all. Rebecca Schaeffer was the loyal CBS soldier. She did whatever was necessary to promote that show. Welcome to Toronto, this is Rebecca Schaeffer. Of "My sister Sam," and I'm David Rapaport. She was on CBS' coverage of Thanksgiving day parades across North America. Happy Thanksgiving. I'm Rebecca Schaeffer and real excited to be doing this parade. While Rebecca was finding success as an actress, she began a relationship with UCLA film student Brad silberling, whom she'd met on a blind date. Silberling would go on to become a successful Hollywood director. At that point, I was 23. She was 19. We got serious very quickly to the point where it scared the hell out of us. And, you know, we were driving around, months later, and she's looking at houses saying, "Oh, we could be there. We could be there." She didn't perceive herself as a celebrity. She didn't live that way. I don't know if I ever heard the term "Fame" come out of her mouth. I think the whole nature of celebrity was something, maybe it was just outside of her interests. She was busy living her life and meeting people and having friends, and you know, she had a boyfriend. The one thing we did say to her though -- "You're on a hit show. We're probably gonna go. We're gonna on this show for a while. You never put your real name on your mail box. Rebecca, never put your real name on your mail box." And she said, "Okay, okay, okay. I won't. It'll be fine. I won't." I was giving her that advice 'cause I had had my own stalking problems. I mean, I literally had police helping me at one point, earlier on, way before "My sister Sam." Because I had a potentially dangerous stalker. And so I never had my addresses ever on my driver's license. So that you can't be found. She was wise beyond her years, but she was naive in some ways because she was very trusting. She had such an open heart. Look, Sam, a letter from E.E. The first time I saw her answering fan letters. She said, "Look, look, I'm getting fan mail. And it's great. And they're telling me their problems, and I'm answering them back. And it's wonderful." And I went, "Wait a minute. You're answering them back? You can't do that." And she says, "Oh, no, but I and it's really fun for me, and they want to be friends." And I went, "Wait, they're not your friends." She was very responsible, if you will, about trying to respond to fan mail. Celebrity's a one-way relationship, often. And so that seemed odd to her. And I think she felt a desire to respond in kind. I told her, "I understand that this is the first time you've experienced this. The only thing you can do is sign a picture with no special note. That's it. You can't answer anything because there are people out there who will misinterpret a letter like you're their best friend." I said, "Don't do this." I said, "It's very dangerous. Promise me you won't." ��������� Smooth moderate to severe lines

This transcript has been automatically generated and may not be 100% accurate.

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