And if you need background information on the Dargers, try these links:
Here's the latest from Huffingtonpost.com
'Sister Wives': The Brown Family Vacations, Clashes With Another Polygamist Family (VIDEO)
On the latest episode of "Sister Wives," the Browns went on vacation with a family that's structured very much like their own. Joe Darger also has three wives, though he married the first two on the same day. It was ten years later that he added his third wive, who was the twin sister of one of his first wives. The non-sister wife is their cousin, so he's keeping his relationship all in the same family.
You can read the rest of the article (and watch the short video) here: