Wat should I do?

Hmm, well maybe you could mention it to your dad, if that is his brother? Perhaps he can say something to your uncle in passing- or if you see him again, and feeling confident, say 'Ya, well girls tend to grow up at some point ..don't think u need to point it out ..' in either a serious, or even joking way (if confrontation makes u uneasy.. it does for me)... make it known it's really not ok to be talking about that to you, or anyone.

I have been in similar circumstance as yours, except he was my dads best friend, I felt embarrassed, and awkward too. But I made the mistake of keeping quiet and this man mistook my silence for I accepted his remarks and one day he took it a step further by attempting to touch me. I lost it and kicked him, and i told him if he ever tried to touch me again or make any remarks about my body that i will tell everyone what he's done and I will make a complaint at the police station about sexual harassment to a minor about him. Then every one will know what a predator he was. He never made a comment again or even came near me, he avoided me like the plague. In saying that, you should tell him straight out thats its not ok to make comments like that to you or anyone else, In future you would like him to stop otherwise you will let others know, including your dad that would kill him! so to speak! don't stay silent....best of luck

That's weird, tell him to back off.