Either close friends, family friends or fun/casual friends. E.g. "hey ... (close/family/fun friend), what are you up to?" I am looking for a word to replace the "close/family/fun friend" with.
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Words you could use to approach your friends in Chinese with are:
老爸 (lao ba) for a dad or 老妈 (lao ma) for a mom. 老兄 (lao xiong) and 老哥 (lao ge) for older male persons and 老姐 (lao jie) for an older female person. 老弟 (lao di) for a younger male person and 老妹 (lao mei) for a younger female person. In all of the mentioned examples, 老 (lao) doesn't mean old. Its closest English equivalent might be "dear". As in "dear ((younger)(fe)male) friend", "dear mother" etc.
Another way for approaching a good friend with whom one shares a lot of interests is 好小子 (hao xiao zi), which is an expression used irrespective of age.
You can use their name - or if you really are close to them probably their nickname.
If it's family you probably need to use their position in the family relative to you 'name'.
More general things: 哥们儿：for friends 朋友：for friends 亲家：for the in laws
Edit: just wanna add 老兄: for friend (you'll sound pretty awesome if you call your friend (male of course - hence the whole 兄 thing going on over there) this).