Following the heated battle between Meri and Janelle that goes way back, spoilers reveal that the upcoming episode of "Sister Wives" season seven will see everything go down in ashes despite the two's efforts in patching things up.

Last Sunday's episode saw the controversial Meri and Janelle once again clashing despite attending a therapy session that would hopefully help them iron things out. It is said that the pair's tension-filled relationship goes way back.

According to Enstarz, fans who've watched "Sister Wives" from the beginning will know that Janelle walked out of Meri's brother's life so she can be with Kody, the polygamous family's patriarch. While everything should have ended as the kids grew up and the family got bigger, their relationship only got more complicated. 

The Hawaii trip is nearing its television airing and spoilers reveal that Meri and Janelle once again won't see eye to eye regarding the best activities that the family should participate in. Meri thinks a sand castle could be good on the beach, but Janelle doesn't want to do anything with Meri at all since they have different ideas.

Aside from Janelle's leaving Meri's brother to marry Kody, the apparent stressful atmosphere between the two only became stronger when Meri revealed in season six of "Sister Wives" that she was catfished.

According to The Christian Times, Janelle wrote in the book "Becoming Sister Wives: The Story of an Unconventional Marriage" that their angst for each other led them to snap even over the smallest matters. "Meri and I went from cordial to frosty overnight. We snipped at each other over the smallest things," she wrote.

It seems that viewers will see more of the snipping and snapping as the title of the upcoming episode itself, "Hawaiian Vacation Erupts," implies that something big will go down. 

While Meri and Janelle are believed to butt heads during the said episode, TV Guide hints that Kody and Meri will look back on their fallen marriage and what aspects led to Meri finding love with somebody else online.

"Sister Wives" season 7 episode 9 airs Sunday, June 19, 2016 at 8 p.m. EST on TLC.