How do I go about finding out about a family members life (whom I never met)?

-I've never met this person but he is still my Uncle. He committed suicide before my brother and I were born. I am wondering all sorts of things like if he had a family and if he had addiction so many other things. I want to know more about him and his life. I have asked but no one wants to talk. For me its important. If anyone can help me in guiding me in the right direction of how to find out my answers I appreciate it a lot.