My parents have been separated and then divorced since I was about 12. My dad has been with his current girlfriend going on 9 years, and my mother with her (long-distance) boyfriend for about a year. My mom is still kind of bitter about my dad's happiness and how things worked out a little "better" for him after the divorced than it did for her. But they are still polite and cordial and on decent enough speaking terms.
For the ceremony and seated dinner we are only inviting very close friends, and then immediately family. During the dance reception we are extending the invite to everybody else.
My question is do I seat my dad with his girlfriend at the same table with my mom and her boyfriend? Or would it be more politically correct to seat them at separate tables? I just don't know if it would look weird having them sit separately since they do get along. Any opinions??