SEAN HANLEY, 35, of New York, had second thoughts about being a firefighter a few years ago when three friends died in the line of duty. But Hanley, whose two grandfathers, father and a brother were firefighters, decided the job was in his blood. He had just finished his night shift when he heard the World Trade Center was ablaze, and he rushed to the scene. “He was a soft-hearted guy who would cry at the drop of a hat, yet he would go and fight for whoever needed it,” said his father, Gerald. “He was All-American, just like all the boys who went down.”