Like some others have mentioned, the first thing I would do is figure out how to do my laundry somewhere else. Even if it means skipping a lunch now and then...don't go over there for any reason except to see your family. Secondly, if you have a place to do it, I would figure a way to have mom, dad and your neice over for dinner some evening. Make it very clear that sis isn't invited. If she won't let her daughter come, tough, just have mom and dad. Sounds like they need a break too. Those things certainly won't solve the problem, but will give you a way to express your displeasure to all involved, without behaving like she does.
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