I saw the episode you are talking about. I thought it was a good illustration of some of the problems with both extremes of Christianity. On one hand, you had a very conservative family who felt that the only point of existence for women is to make their husbands' food and proudly proclaimed that they "brainwash" their children, and on the other hand, you have parents that seemed to encourage their daughters to get into inappropriate relationships, and were reluctant to say that if they "made a mistake" before marriage that it would be sin.
This was one of their funniest episodes. My favorite part was where they debated the meaning of doulos (or at least debated how to pronounce it). I was also a little shocked when the one dad told the swapped wife that he was proud about how he had been brainwashing his children since birth. He totally came off like a cult leader. And then the next day the wife brought it up to his kids what he said, and you could see it shook their faith a little, and then he went into that lame explanation about how he just meant "brain-washed" as in "washed in the blood of Jesus". That's not what he meant. As parents we need to teach our kids how to think critically and guide them into truth so that they can internalize it on their own-not brainwash them.