I can't imagine how his cousin must feel to this day.
One of my coworkers at that time had a sister who lived a few blocks from the Trade Center. At the same time, his parents happened to be in Washington D.C. on a short getaway. Everyone in his family turned out to be okay, but I remember meeting him at the restaurant we worked at and watching the news on TV in the bar together. He had gotten a text from his sister early in the day reassuring him that she was okay, but he couldn't get a hold of his parents for a long time and was very visibly shaken.
It was a very strange day.