Hi @MrsC1990 I’ve read and re-read your posts and I honestly can’t see why you are so upset.
Your sister has said that IF she has to cut numbers attending her wedding, she will cut her siblings’ partners. You may think that in her shoes, you would cut distant aunts or whatever instead, but it’s not your wedding AND you don’t know what other considerations she has eg has Old Auntie Maud already paid for accommodation? Is Uncle Tim pressuring her? Your sister potentially has some tough decisions to make.
It’s sad she wasn’t able to come to your wedding due to your parents’ racist attitudes, but as a teenager living at home I cannot imagine she had any say in this. I don’t see any connection between this, and potentially asking all sibling partners and DC to not attend due to COVID restrictions.
The fact you are married and your siblings are not is irrelevant.
Tbh many women would love to enjoy a grown up wedding celebration whilst their DH takes care of their DC at home.
You have no reason to feel snubbed or insulted by these decisions. And if you choose not to go, your sister has every right to be upset with you.
If I’m wrong it’s because there’s a massive backstory you haven’t told us.