Filming a love story centred on two mentally challenged people is a touching idea, one that's been attempted in, for example, Benny and Joon. The Other Sister is another addition to the genre, a well-acted comedy-drama centring on the romance of Carla (Juliette Lewis) and Daniel (Giovani Ribisi) and throwing in some general family angst as a secondary story line. The acting is tremendous--Lewis and Ribisi both give convincing performances without condescending to their characters. Diane Keaton plays yet another charming scatterbrain, this time as Elizabeth Tate, the uptight, rich mother who wants a picture-perfect life. But good acting isn't enough here. These fine actors drown in a sea of mediocre writing, and we are left with a film with no real conflict or tension. Will Carla and Daniel make it work? Well, of course. Will mother Elizabeth loosen up about her "gay workaholic" daughter and let Carla live her own life? Do you really need to ask? There are a few cringe-worthy moments that have a sense of truthfulness, such as when Daniel stands up at Carla's sister's wedding to announce his feelings. But otherwise, these characters live in a pampered, fairy-tale world where the worst thing that happens to them is that the meanies at school put chewing gum in Daniel's bike helmet. Ultimately, this is a sweet, albeit occasionally saccharine, tale that will move those who are looking for cheerful fare. --Jenny Brown