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This is a tough one because there's going to be drama and a reaction no matter what you decide. It then becomes a choice of which drama to deal with.
Your parents mean well but they are also part of the dynamics with their enabling and (understandable) wish to keep the peace.
I commend you for going out on your own and having your own stable home and relationship. The distance is also a part of decreasing the drama between you and your sister, and it's also the "normal" part of maturation for you, as a young adult.
It seems your sister has made some progress too, but how much contact with her and what boundaries you wish to have are still your decision. Since you still are connected to other family members- parents, other relatives, you will have some contact with your sister at times too. How much will need to be your decision, based on your feelings, time, and how much feels emotionally safe to you.
You may feel pressured to let everything go and "turn over a new leaf" according to what your sister wants. People mention forgiveness but that isn't the same as having no boundaries or forgetting. It's a decision for yourself, based on giving yourself peace. It doesn't mean opening up the oportunity for being treated poorly. One way to look at this decision is according to your own values, not your sister's wishes or ideas.
If it were me, I'd make a list of the pros and cons of "yes" and "no" and where to draw the boundary line. With my BPD mother, the line kept moving. If I said yes to a request, then there'd be another, and another, until eventually I said no- and she'd react as if I didn't say yes to any of them. It seemed that unless I agreed to everything she asked, which meant no boundaries, it wouldn't be enough for her, so I just had to come to terms with that, and agree to what I was willing to do.
One example was a birthday party of hers. She wanted us to get together with her relatives the night before but I told her everyone would have been travelling all day and wanted to rest up for the party the next day where we'd see all the relatives, and we'd like her to join us for dinner- just her. That led to a reaction on her part, and changed the mood for the rest of the weekend.
With the wedding, showing up for a few hours in a dress the bride picks out might be tolerable for the sake of family peace and not rocking the boat with parents- however, a concern would be the associated events- the rehearsal dinner, bridal shower, and the frequent contact with the bride. As wonderful as weddings are, the brides are stressed and you don't want to be a frequent outlet for your sister's stress.
I felt similar issues when planning our family events. We'd invite BPD mother- but once she was invited, there were the phone calls over the food, the guest list, requests to invite people in her circle, and then the attention she needed during the event. It's like it opened the door to frequent contact over the event and more boundary negotiations.
Looking at a "yes"-
Saying "yes" may feel like letting your sister off the hook but it's possible that accountability on her part isn't going to happen, due to her own disordered BPD thinking. If you say "yes" to being in the wedding party- it would feel more acceptable to you if do it from your values, not about her, and also without expectations of how she behaves.
If you do say "yes", also decide on other boundaries. "Yes" also means the rehearsal, rehearsal dinner but it doesn't have to include the bridal shower, dress shopping, or being available for your sister to call you when she feels stressed.
Looking at a "no"-
If you say "no" - also do so based on your boundaries and values, because there will be a reaction from your sister and parents to deal with too.
It seemed that when there were family events involving BPD mother, she found some reason to be upset. It felt demoralizing. In examining my own feelings, I realized that I had expectations, hopes, that somehow she'd respond differently but she had her own feelings to manage.
After that I decided that if I said "yes", or did something for BPD mother, the decision would be based on me, and not with any expectations of how she was going to behave. Same with a "no". Also pay attention to your feelings. A "yes", based on wanting to do something or being willing to do it (we sometimes do things we don't always want to do- but are willing to do) then you won't feel resentful. When we say "yes" to something we aren't willing to do, but we do it out of FOG, we feel resentful.
If you say "no" to being in the wedding party and still attend, will that be awkward? Or should you not attend at all? If you say "yes" to being in the wedding party- in order to maintain some peace in the family, that includes the rehearsal dinner, you'd still have to have boundaries on the rest of it. "No" to the shower? "No" to being available for your sister to vent to? Whatever you decide- consider all the steps and aspects to this wedding and where you need to draw the boundary line, and do it without expectations of how your sister behaves. She's going to do what she does.
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