For a little background, I haven't spoken to one of my aunts for 2 years. She and my mother have been in a feud and my aunt dragged me into it by publically shaming my mother. It was devastating to me to see my mother hurt so much.
I have no desire to have a relationship with her so I did not invite her to my wedding. She ignored my grandmother's death (on my dad's side), ignored my law school graduation, my engagement etc.
That being said I invited her two children who are 12 and 8. I've gotten heavily criticized for this decision but in my opinion my cousins did nothing wrong and I didn't want to exclude them because of their mother. I knew they likely wouldn't come but thought if they wanted to come they were welcome to come with my other aunts and uncles or grandma.
We'll I just got the RSVP card back in the mail and of course it was a NO. But even worse, on the "Declines with regret line" my aunt crossed out the "with regret." She went out of her way to be hurtful and I'm just so so sad and angry. :-(