Wedding Guests

So I've been dealing with thing question for a while now of whether or not to invite certain parts of my family to my wedding.

Basically a couple years ago, one of my cousins was kinda cut out of our family, and no one really talks about it except for the once in a while when her name gets brought up and there is very obviously still hard feelings.

My problem is that I grew up pretty good friends with this cousin, but also really close to that side of my family.. so do I risk my wedding for a possible reunion- also risking that I may have either party not come- Or do I just accept that it's not my place to get involved and celebrate with people who I know for sure will be there and happy for me?

I know it's "my wedding, my choice" but I just wanna hear what other people might do in this situation. I need other perspectives.