My parent has always been difficult and "quirky." In a conversation she was saying very hateful things about a family member. I responded, "Stop that (name), that was totally wrong and uncalled for." She responded back in a slightly different voice (more childlike) -- "yes, I know I was being a bad girl." It make me think she was a different person (personality). She has done and said hurtful things over the years that she claims she is innocent of. Is this multiple personality, or is it a regression to childlike behavior -- indicators of dementia?