I don't know how to respond. I (24F) just found out that my estranged sister (44F) has been asking my parents about being a bridesmaid in my wedding. We're not close. She was there for me when I was too little to remember (<4) as a surrogate parent? Babysitter? Older sister figure?? While my parents where going through their divorce. I don't remember that relationship with her, and since she moved out and to another country, we don't talk. She and my dad have a rocky relationship, so she didn't really interact with me growing up. I tried reaching out a bit in adulthood, but there's little available time and wheat feels like interest and energy/effort to put forth for it.
I have nieces and nephews I've only met at our other sister's wedding a few years ago, and haven't heard much or talked to/about since. Now I'm being blindsided with having to tell her and likely her kids (I think 10-12 years or less younger than I am) that they're invited, but not in the wedding party. I never made any notions as such, so I don't know where this is coming from.