'Sister Wives': Kody and Christine Argue About Whether or Not They're Divorced (Exclusive)

In ET's exclusive look at TLC's 'Sister Wives,' Kody and Christine argue about whether they are divorced following their split, since they were never legally married.  In a side interview, the Brown family patriarch talks about how the two of them never made an official agreement or signed any papers to officially confirm their divorce. Kody’s legal wife, Robyn, chimes in and says they should ask their church for a divorce, but neither Kody nor Christine are members anymore. Meanwhile, Christine doesn't see the problem in saying the 'd' word.