What's there to say that hasn't been said already in my review of the first series and the second one? Perhaps that the focus is, once again, on the supporting cast -- but the three sisters keep playing a major role. Perhaps about the format: each episode is divided into four 'scenes': one before the opening, one between the opening and the eyecatch, one between the eyecatch and the ending, and one after the ending. Yes, that's kinda weird, but it gives a clear separation, which means the writers can more freely move from one subject to the next.
Once again, it was fun to watch, and once again I'll give it a 7.