Lost my post so I must not supposed to be trying to be wise yet.
Let me just say for now that accepting might be the only option, but if that's the case, maybe we can figure out a way to get rid of the infuriating and wrong part.
Also, if you tell your sister how hurtful this is to you, is there any chance she'll tell you straight up what the deal is and help you figure out a more palatable solution?
I'm off to bed, but I'll check you out tomorrow.
xo
O