Guys Prefered +girls What do I say to this guy that I've known for years that happens to be my uncles friend?

Well if you both already know that you like each other than why not go for it he sounds like a great guy and you sound like a nice girl I think you to would do well. I would just tell him that I still had a thing for him and see what he says and if he still has a thing for you then your good to go. Good Luck! :-).