"It's very hard on [Kieran], and she carries so much guilt about the fact that she is healthy," Wohlenberg told ABC News last year. "She feels this tremendous sense of responsibility that she has to be perfect. ... She is going to get a scholarship, she's going to go to medical school and why? So she can cure us."
Kieran does well in school and excels at swimming. She misses her sisters but is doing the best she can, the family recently told ABC News.
Wohlenberg says there's a reason to make the family's battle public, especially because so often, people express surprise at how "normal" the Wohlenbergs look on the outside.
"I'll describe something, then [people will] say, but you're so normal, you're so everyday," Wohlenberg said.
"And it's like, that's the whole point of this. This is why I want to talk about it because we are everyday and there are people who are struggling with mental illness in the everyday world.
"They're not these monsters that people make them out to be," she added. "They are somebody's child, they are somebody's sister and they deserve to be fought for."
And continuing the fight is exactly what these families plan to do.
"[Rebecca] says, 'I know that my mom, me and her we're fighting for me, fighting for me to be better,'" Cinnamon Stancil said. "Which, you know, makes me feel better that she knows that we're in this together."
Watch the full story on "20/20" Friday at 10 p.m. ET.