Breia Brissey
June 22, 2012 AT 07:09 PM EDT

In Sunday’s tell-all special of Sister Wives, Kody Brown and his wives sit down with NBC News’ Natalie Morales to discuss polygamy, life in Las Vegas, and their new book, Becoming Sister Wives. In the no-holds-barred interview, the Browns open up about how each wife came into the family and discuss some of the personality conflicts that nearly drove them apart.

The wives also address some of the turmoil they experienced because of pregnancy issues. After three years of being unable to conceive, Meri had to adjust to the news that Janelle was pregnant. In this exclusive clip, Janelle shares her indifference for Meri’s feelings: “I didn’t care how she felt about my news,” Janelle admits. “If it upset her, so be it.”

Morales also chats with five of Brown’s oldest children who speak candidly about life in this very unusual family. The Sister Wives mid-season finale airs Sunday at 9 p.m. on TLC followed by the tell-all special at 10.

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Read more:

‘Sister Wives’ stars defend polygamy—EXCLUSIVE VIDEO

‘Sister Wives’: The Brown family deals with a miscarriage scare—EXCLUSIVE VIDEO

‘Sister Wives’ season premiere: Am I the only one more interested in the family drama than the polygamy at this point?

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