Two bits of A.O. Scott's review (which ends rather suddenly as though he ran out of time before his deadline, capture the spirit):
You could call “Your Sister’s Sister” a group portrait of youthful solipsists in an era of economic contraction and social malaise, but that wouldn’t be quite right. Self-absorption is not the subject; it is the paint.And:
Unfortunately the easygoing mood does not last. The film’s late swerves into melodrama and the neighboring region of farce feel panicky and pandering. The subtlety of the performances — Ms. DeWitt’s in particular — is sacrificed for easy laughs, shallow tears and a coy trick ending. Just when it was starting to get interesting.Not a perfect movie, but I liked it better than either A.O. Scott or my wife. It is gentle fun, and you get a lot of really, really gorgeous Pacific Northwest scenery.
Oh, and a note to A.O. Scott, the cabin is on an island in Puget Sound, not on the coast. Get your map out, man!