Regarding Barb having dementia - I took Chris' admission that Barb was having occasional memories of being a child as a horrible sign. Not only is "sundowning" a dementia thing (as another user stated), so is mental regression. Having vivid memories of being 2 years old does not sound like an elderly woman's mind improving, it sounds like an elderly woman's mind creating false memories in moments of regression. If Barb is actually regressing like that, it makes what Chris did even worse if that's possible. He was basically molesting someone with the mind of a child, and the frail body of a person close(ish) to death. That's pretty fucked if you ask me