wow....
I actually give you a lot of credit for even maintaining a relationship with your sister/bro-inlaw. If you have been big enough to do so through so much and let it slide (something i don't believe i would have been able to do), i think you'll be able to get over this smaller, more recent issue.
However, if it's something that's been lingering for a long time and this was the "straw that broke the camel's back" then i think it might be time for some distance. Give yourself some time away, which i think helps a person put things into perspective and realize how they want to proceed (ie. letting cooler heads prevail)
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