[Jim O]

I'm going to buck the trend here but I say if you can't convince her to wait go to the wedding anyway. It sucks, you're being screwed and taken advantage of, but it's your sister. She's always been your sister and always will be your sister. Money will come and go. If you skip the wedding it may well cause hurt that will take years to heal, if ever it does. I'm guessing based on your young age that one or both of your parents is still living. It's likely that you and she both will outlive them along with your other siblings if any. I'm in that position (both parents dead many years) and it's an awful thing to think about not having a close relationship with my one brother. I have a great wife (15 years tomorrow) and three great children, but none know me since my earliest memories, and none shared my childhood with me. Bridges burnt are hard to rebuild.