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This is pretty normal. I'm pretty good friends with my wife's sister. The key thing is to be open with your friend about the things you discuss, etc. You should also never cross a line in conversation unless they ask you. For instance, my sister-in-law would ask me for relationship advice (i.e. why do guys do certain things). I used to give it to her until she got married 2 years ago. Now I tread carefully and offer such advice only through my wife (who is best friends with her sister). I'm not particularly close to my brother-in-law, but I feel that offering such advice now has more implications than when she was just dating guys.
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