Like others said BPD's "ups" and "downs" are all within the same personality so one person would have the same account. As for multiple personalities, that's very possible. In many cases, someone with multiple personalities does not even realise that they have them because the other personalities opperate without consciousness from the primary person. I suppose if a mom had additional personalities, they could have CM accounts that she wouldn't even know about :-)
We reviewed a case study when I was in school where a mother brought her daughter in to a therapists office claiming the daughter had multiple personalities because she "didn't even know her own daughter half the time." It turned out the mom had multiple personalities and would only bring her daughter to therapy when she was acting as "Kate" but never herself as "Katherine." Interesting!
at 7:14 PM on Mar. 6, 2009