The grand tradition of the dramatic road trip movie, so splendidly rendered in films such as Rain Man and Y Tu Mamá También, can add a new sentimental two-hander to its ranks in Sheridan O’Donnell’s Little Brother (A-), an intimate and inspiring indie that world premiered at the Atlanta Film Festival. Jake, portrayed by Daniel Diemer, has been tasked by his father (J.K. Simmons) to reluctantly transport his suicidal older brother Pete, played by Philip Ettinger, home for a family intervention. The dynamic between the central brothers in motion through a brittle journey to face their sometimes fractured bond, is thoroughly captivating, alternately heartbreaking and hilarious; and their pathway through the gorgeous West in locations such as Albuquerque and Twin Falls makes for an enjoyable and enlightening ride. As Pete, Ellinger diffuses the effects of mental illness with humor and regression to juvenile highjinks to mask his inner tumult. He’s consistently absorbing and magnetic in the tricky part. As the sometimes stoic straight man, Diemer has a tough role too and slays it with steely restraint. His tender depiction of abiding brotherly love is also sublime. When the siblings come to breakthroughs in how to confront and reconcile mental distress that’s not likely to vanish from looming large, O’Donnell continues to nourish the story with direction and dialogue which is rarely reductive or overly sentimental. This is the kind of movie that can save lives, and its notions of making the most of one’s lived experience and savoring the familial bonds to lift us when most needed have the power to deeply move.