In the clip of the recent finale special, Krishnan next asked Robyn if she'd ever encourage Kody to seek other wives in the future if he can't reconcile with any of his previous wives.
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"I can... but I'm scared of it because of how badly this has gone," Robyn said.
Earlier in the same clip, Christine said that she couldn't see a situation where Kody marries another woman, even though he and Robyn "dream" of living a polygamous lifestyle.
"I don't think that they would go look for another wife after this," she told Krishnan.
"And if you already have this much failure behind you, would you really want that again?" Christine asked. She also called Robyn and Kody "soulmates" and wondered whether there was "room for anybody else" in their lives.
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The final part of "Sister Wives: One on One" airs on January 8 at 10 p.m.
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