While the Browns are prepping up for their big Hawaiian vacation, sparks will fly between Meri and Janelle after they disagree on the type of activities that they should participate in for the upcoming episode of "Sister Wives" season 7.

Based on the teaser for episode 9, titled "Hawaiian Vacation Erupts," Meri believes that building a sand castle on the beach is a good bonding activity for the family. But Janelle thinks otherwise, since she believes that there are other more enjoyable things to do in Hawaii. Because of this, the sister wives will once again be in the middle of another conflict.

Fans of the series are aware that Meri and Janelle used to be very close friends when Janelle was still married to Meri's brother. But the two began their animosity when Janelle decided to leave her husband to have a polygamous relationship with Meri's husband Kody.

Over the years, the two managed to live harmoniously together as one family. But they once again went through another rough patch when Meri got involved in a catfishing scandal.

In season 7, Kody and the sister wives will go through a series of therapy sessions to fix their problems after the catfishing incident.

After one of their sessions, Meri says in one of the clips: "We both realized we do things completely differently. But we also have years of reacting to one another's differences."

Will the two wives fix their relationship during their Hawaiian getaway? Based on the synopsis for the upcoming episode, it seems like more fights will erupt on the tropical island.

The synopsis for the episode reads:

"The Browns' Hawaiian vacation devolves into fights over parking cars and where to put the beach umbrella. Meanwhile, Kody and Meri try to figure out where their relationship went wrong."

"Sister Wives" season 7 episode 9 airs on TLC on Sunday, June 19.