PG, Sister Wives is an interesting show. When you have a chance to watch it, you might want to pay special attention to hiw the wives deal with emotional needs in relation to their husband and how it affects the wives' interactions. You might even consider asking Ki and Ka if they'd watch it with you and use the episodes as a vehicle to other discussions. You've mentioned before that you're more introverted, so this may help get the conversation to areas that are hard to reach on their own.
PS: apologies for the typos. Most of my replies are on a smart phone before sleep, and the keyboard and screen size may review a challenge.
Best of luck!