As the Twig Is Bent(1915)

L.C. Shumway has a dual role in this action-packed three-reeler. When the Booths divorce, their twin children (both played as adults by Shumway) are separated -- George goes with his mother and becomes a fine, upstanding young man, while Herbert takes after his father's dissolute ways. Both of them wind up serving in the Army and going to the Philippines -- George as an officer and West Point graduate, and Herbert as a lowly enlisted man who soon deserts to becomes the drunken love slave of a native girl.