This is a comedy about what might be considered an alternative family, if only its members didn’t suffer so acutely from the same doubts, temptations, insecurities and longings that people in nearly all families do. The Kids Are All Right is more universal than it is alternative, except in one sense: There’s nothing else on the contemporary movie landscape like it. Annette Bening and Julianne Moore play Nic and Jules, a long-committed couple with two teenage children. Joni (Mia Wasikowska) is a National Merit Scholar about to head off to college; her younger brother, Laser (Josh Hutcherson), is a kid who’s perhaps just on the cusp of being aimless (his mothers both worry that he may be hanging out with the wrong crowd), though all he’s really going through is the usual confused-teenager stuff. [. . .] The Kids Are All Right is certainly topical in light of the national gay-marriage debate. But this isn’t a picture that’s out to make points or delineate political issues; if a...