In the clip, the socialite sisters clash over living spaces, as Kourtney, 33, rankles Kim by making unilateral decisions about a house they plan to share.
During one inspection of a place, Kourtney -- who has two small children, son Mason and baby daughter Penelope -- declares the abode doesn't seem "kid-friendly," immediately dismissing it as on option much to Kim's chagrin.
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"Every time I move in with Kourtney its really frustrating," said Kim, 32. "She makes me feel like opinion doesn't matter."
Also on this week's show, Scott and Khloe's relationship takes a weird twist, and Rob is bummed out by a break-up.
Watch the video on RadarOnline.com
Kourtney and Kim Take Miami airs on E! Sunday at 9/8c.