How do I convince my family to invite my non-Jewish partner to Shabbat?

Dear Sex and the Shtetl,
One of my partners is Jewish and the other is not (we are polyamorous). My Jewish partner doesn't enjoy participating in festivals or Shabbat. My non-Jewish partner, on the other hand, is super interested in all of it. I would like to bring my non-Jewish partner to a Friday night meal with my extended family but my parents think it's inappropriate. Are they being unreasonable?
Jew-nicorn in the Shtetl

Dear Jew-nicorn in the Shtetl,

So you’ve got one partner who shares the heritage but has no interest in sharing the herring, and another who’s got all the ruach but none of the bloodline. In other words, your Jewish partner shrugs at Shabbat while your non-Jewish partner wants to lead the blessings, and your parents are clutching their chai pendants as if you’ve just invited Kanye to officiate your nephew’s bris.