My question is this: When it comes time for my wedding / college graduation / some huge party event, should I invite her? My mom's side of the family is considerably larger than my dad's side, and naturally, they pretty much hate my dad and his girlfriend. (My dad's family isn't too keen on her either, but that's besides the point.) Do I invite my dad but not her, not invite either of them, or invite them both and buy a carpet cleaner for when people start killing each other?
I'm not in danger of having to make this decision any time soon, but I'm just curious what other people think.