I know this sounds nuts! read on, i promise it gets more complicated:
brother and his ex eloped at a really young age, then had a ceremony a couple months later. she acted like a TOTAL nutcase bridezilla, demanding a ridiculously priced cake, stating over and over "it's my one day," etc. not surprisingly, they got divorced a couple years later. we've found out she has a personality disorder which can account for a lot of her maniacal behavior, but it doesn't make her any more tolerable to be around hen she gets in one of her crazy moods.
her parents, however, are some of the most wonderful people I've ever met. they live in my parents neighborhood, and I really enjoy seeing them. they have my niece during the ex SIL's custody because she's living with a BF, so my parents are allowed to have my niece on Sundays (which explains why we still have regular interaction with them).
here's the question- i would love for them to come to the wedding, but i don't really think there's a way to do that without inviting the ex SIL too. am i correct? or would it be ok to leave her out? my brother won't be there because of his deployment (whole other issue).