My parents recently got divorced and my mom started dating this guy and now they've moved in together. I read that you're always supposed to invite the partner of the person you're inviting, but I really don't want her boyfriend at our wedding. He's got a very abrasive personality, my fiance can't stand him and my siblings (not to mention my father) don't like him either. In fact, my youngest sister is now living with my father 100% because she feels so uncomfortable around my mom's boyfriend. But, my mom is paying for half the wedding and I don't want to seriously damage our relationship, but I also don't want to make things stressful for us and the rest of my family at our wedding.
What should I do??? Help!