AITA for warning my sister against inviting her exes to her wedding?

My twin sister [28F] and her fiance have known each other for 13 years and have been dating for most of that time. They had a brief period where they dated other people but honestly they have ALWAYS been in love with each other. They’ve left a trail of broken hearts along the way, on both sides. But at last they’re ending up together, for good.

Anyways, they’re getting married in a couple of months. His family is rich so the wedding will be big and fancy. I’m talking hundreds of guests for the ceremony and reception.

I’m helping my sister with the guest list and she’s planning to invite 3 of her exes. One high school fling, one guy she dated for 6 months, and another dude she dated for 1 year and broke up with a. few months before she started dating her fiancé again. The first two are fine I guess but the third guy might actually come and I’m afraid of the potential drama. She says “its no big deal” and that they’re civil with each other. Plus, she even knows his current girlfriend.

Her fiancé is also planning to invite 2 ex girlfriends along with their current partners. I told her that its going to be drama central for both of them, and that they don’t want that on their big day. At my wedding, my husband and I had a strict “no exes” policy.

I don’t think this is a good idea, especially since she broke her last boyfriend’s heart and he didn’t get over her for a long time. I’m not sure he’s over her yet. But my sister got huffy and said I don’t have to help with the invites if I’m going to be judgmental.

AITA? My advice is coming from experience and genuine concern.