Get ready for a big shake-up on TLC’s “Sister Wives.”

The reality show’s patriarch Kody Brown has divorced one woman so he can marry another, E! Online has confirmed. Before the divorce, Brown was only legally married to Meri, but called three other women his spouses: Janelle, Christine and Robyn. Under the radar, Brown recently divorced Meri and is now legally wed to Robyn, the youngest sister wife.

“We have chosen to legally restructure our family,” the Brown family said in a statement obtained by E! News. “We made this decision together as a family. We are grateful to our family, friends and fans for all their love and support.”

Though neither Brown nor TLC explained why the family went forward with the divorce, entertainment website Zap2it suggests the swap may have been made to provide Robyn’s three kids from a previous relationship with more security within the family.

Between the four wives, the Browns have 17 children.

In the past, Brown has said that his plural marriage is similar to any other marriage in that all of his wives are free to walk away from the relationship at any time.

“We chose to be married,” he told Today in 2013. “Nobody forced us to do this, and we choose to stay in it out of love and commitment. Just like any marriage. I hate to say it, because I don’t like divorce -– nobody likes that –- but my wives are free to leave, if they make that choice.”

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