You Can Count on Me (2000)

The best film there is about the sibling who stayed home and the one who drifted. Laura Linney's Sammy, a single mother in a small Catskills town, is thrilled and then exasperated when her unreliable brother Terry (Mark Ruffalo) turns up needing money and a place to land. Kenneth Lonergan's debut as director never pushes for big scenes; it lets two orphaned adults fall back into the roles they have played since childhood, protector and problem, and finds both comedy and ache in it. Talky, humane and endlessly rewatchable.