October 14, 2011 at 07:42 PM EDT

During this Sunday’s new episode of Sister Wives, the patriarch of the Brown family returns to his hometown to see his childhood best friend’s family. In this exclusive clip, Kody brings along his wives, and once again they have to defend their lifestyle choices to the ladies of the family who are all curious about polygamy — specifically, their sleeping arrangements. “They cannot wrap their heads around why we want to do this,” explains wife No. 4, Robyn. “They don’t get it.”

Also during “Defending Polygamy,” which airs Sunday at 9 p.m. on TLC, Robyn and Kody reveal the sex of their baby and announce the name.

Read more:

‘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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