I don't really know how to word it. I come from a fairly dysfunctional family. Mother is v controlling (bordering on covert narc) and everyone dances to her tune. I have two sisters, one is very much the golden child and I am very much an 'identified patient' type.
After years of therapy and having my own family I am now able to deal a bit better with my family and see them without getting too upset. Some of the controllers have backed off, but not my golden child sister.
Recently I arranged to meet up with my other sister to meet her new boyfriend. We arranged this separately to my GC sister and it was in the middle of the working week when my GC sister should have been at work.
All was fine until GC sister demanded to know when and where we were meeting, other sister told her, and GC sister and tried to change the arrangements (so we were meeting at her new house which she wanted to show off). In the end we met where we were originally supposed to be meeting, but GC sister did come along, in the middle of her working day!
I feel like my GC sister seems to feel that I need to run my plans past her and I am pretty upset she behaved this intrusively over a meet up with my other sister. She wasn't even pretending! There is a family narrative that I am 'not a good big sister' but she is, to our youngest sister and I feel she feels she has a right to dominate any relationship between me and my other sister. Similar things have also happened when I have arranged to meet cousins and other family members; she gets a whiff of it, invites herself along and makes it on her terms which others allow her to do.
What do I do? Who do I speak to? The youngest sister who lets her get away with this shit (she was very agreeable to my GC sister trying to change plans) or the GC sister? Due to family dynamics any conversation I have with GC sister will be proof I am mad, bad and horrible at worst, and petty and immature at best.