An alert teenage boy saved his younger brother from being sexually assaulted when a Plymouth janitor in a town-owned hall allegedly tried to take off his pants, authorities said. ``My oldest son did something that you wouldn't think a 14-year-old could do - he was smart enough to deal with the whole situation,'' said the boys' father, who didn't give his name for fear either son would be identified. ``It could have been a lot different. I shudder to think about it.'' The teen accompanied his 6-year-old brother into the bathroom of Memorial Hall in Plymouth when the janitor, Andre...