GIRL TALK: He Gives Me The Creeps
I'm sorry you have to deal with this creepy dude. If you feel that anything he has been doing or saying is inappropriate or is more than you are comfortable with, tell someone! This may be hard since he is your dad's friend but you should let your dad know that you don't like the way he acts around you. Choose your words wisely though. It's probably not a good idea to go up to your dad and say " Dad, your friend _______ is SUCH a creeper!". Just say, "Hey dad, I'd rather not be home when ____ comes over, he makes me feel uncomfortable when he talks to me or gets too close." Your dad will get the message and distance you or both of you from this guy.
If the guy continues to pursue you or won't leave you alone, have another talk with your dad, or both of your parents. They'll figure something out for all of you to keep you safe.