How do you deal with closeted extended family members who have not come out to you?

Soooo, there is this cousin of my cousin(not directly blood related to me and is 20) that I am sure is either gay or bi just by the way he looks and carries himself. The gaydar goes off all the time around him. He is attractive, but I am not trying to hit on him as I have a bf. But I really wish he would just come out as it would be cool to talk to someone else who is a queer male other than my uncle. I do not see him terribly often, but he is on my cousin's other side of the family. So, I will see him at funerals, weddings, and graduations etc. How do you drop hints that you know about them without seeming aggressive? If you have been around them, how is it not awkward being around them in fear of slipping up?