Dilemma - adult nieces @ wedding but they are ex-inlaws

Do you want them there? Then invite them. If you don't, then don't. Since they are adults, they don't have to be invited with their parents or anything like that.

If you want them there and your FH doesn't care, go for it!

Echoing what others have said: if you want them there, invite them! Especially since they're all adults, they can definitely be invited without any others in your ex's family if you're not close to them.

For what it's worth, I'm inviting my uncle's ex-wife, their kids, and her new husband to my wedding, but not my uncle. He's burned a lot of bridges with our family and treated her terribly, so we consider her closer family than he is.

If you're still close with those nieces and nephews, then by all means invite them! You're all adults, and you're not obligated to cut them out of your life just because your first marriage didn't work out. I invited my aunt, even though she and my uncle (dad's brother) have been divorced for almost ten years. Now neither she nor the uncle came in the end, but still, I would have felt bad if I hadn't. It sounds as though you're closer to these nieces than I am to that aunt or uncle. If your ex or their parents raise a stink, too bad.

: O) love it