To Invite or Not? Wedding Dilemma

[BetteDavisEyes]

Hi everyone. A while ago I had posted about my cousin who got married last September & did not invite my family b/c she told us that her fiance's (now husband) family from Boston were not used to being around "people like us." I'm assuming this meant California Latinos b/c that's what we are. She invited my mom & one of my sisters (I have 6 sisters & 1 brother).
Now, I am wondering if I should invite her & her hubbie to my wedding this December. My mom thinks I should out of respect for my aunt & uncle who helped raise me but my sisters say I shouldn't invite her b/c she disrespected & insulted our entire family by excluding us from her wedding.
I don't want to start a family war over this so I think I should be the bigger person & just invite her & not bring up her wedding but everytime I think about it, I get pissy.

Any advice and/or opinions? I would really appreciate any and all help on this b/c my family is biased as well as my fiance. He thinks I shouldn't invite them but I am inviting her parents & two brothers so I'm stuck.