Hardly at all. I have 1 uncle who lives anywhere near me, and that's it. I don't even know him that well either, because we don't often do anything together, he goes out with my parents.
I know my best friends extended family better than my own, not that I'm really complaining.
Almost all of my cousins and uncles save one are bogans, who I'd rather not spend time with. One's a racist, one's someone who raised their kids to be drunk, and those 24/7 phone facebook guys who will post a status at 3 AM how there's nothing to do, so he's going to mcdonalds. I think he sleeps about 2 1/2 hours a day and just spends the rest on facebook, and the last uncle is someone who I've barely ever talked to.
Then on my mum's side, that's not great either. Only one aunt and her children are alive, but she's annoying and has 3 mummy's boy children that are barely independent at the age of 18. My mums brother was a conspiracy theorist, and right at the limit where you wouldn't quite call him crazy, but he wasn't far off.
My parents are so different to their family, it's bizarre. My entire dads side is a typical small town bogans, while my dad writes computer programs. My mums family was just flat out weird mostly, but she's perfectly normal. I am pretty close to my great aunt though.
I also have met my grandparents, but not much, and I really don't know them all that well.