People Locator

My father asked me to locate his nephew, my cousin, here in the US. He is the son of my father's only brother who passed away years and years ago. My father just wanted me to contact them because we haven't heard anything from them for a long time. The last time my father heard was that their Mom, my aunt, is already here in the US as well. I am thinking of using a People Locator online such as in worldwidepeoplelocator.com to locate them. This service will give me a detailed result of my search which I really need. It will pull out result in seconds and will not give me a hard time looking for the information I need. Hopefully I will be able to at least know their address or phone number so I can call them up.