So, I really liked this view into a dysfunctional family through the lens of a differently dysfunctional being (robot or alien, it doesn't matter to me). For me, this story seemed to poke at our society's obsession with "reading people" and getting "social cues", when new research is showing that this just doesn't happen. There are so many different possible explanations for any given action or expression, that it's just a matter of guesswork to "get it right." People who are supposedly "good at it" are just particularly average, so that their guesses, based on their own experiences and outlook, are more likely to be right. Rosie, being decidedly very un-human, not surprisingly rarely gets it right. That aspect was particularly interesting to me.
I do have one quibble about the story. At the very beginning, Agatha says that getting Rosie was "embarrassing." This made me think that there was some social stigma associated with getting (or needing?) robot help. But this was never developed and I am left wondering what that was all about. Any insights from the forumites?