I once had a friend very much like your sister. This friend was a lot to deal with and took up so much time. One thing I'd advice is setting boundaries. If you can't talk to your sister outright about that, do it slowly. Start saying 'no' to little things, and gradually progress. In my situation, my friend got married four years ago and now puts the burden that was on me on the spouse (not that that will help you much, but for me it was a godsend). But boundaries are critical.
But again, boundaries are critical. It'll probably be harder to establish them now because it seems like there were not many clear ones before (I understand that is hard - she is your sister). But if you don't want to keep doing this, they need to be made. Tactfully, but still.
Good luck.
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