Serial ukazuje najbardziej obsesyjne i nierozłączne relacje wśród rodzeństwa. Niektóre siostrzane więzi są bliższe niż inne, ale to rodzeństwo doprowadza swoją obsesję do skrajności.
Twins Anna and Lucy strive to live their lives identically. Patrix and Patrica revisit a not-so-secret, sisters-only plan. Baylee and Brooke's sleeping arrangement is straining Brooke's marriage.
Jessica is extremely unhappy when her sister starts dating a new guy. Brooke and Baylee struggle with Denver's ultimatum. Patrica gets cold feet. Anna and Lucy take a big step in their relationship with Ben.
Christina tries to mend her relationship with Jessica before she drops some big news. Ron puts his plan to get Patrix's mind off Orlando into action. Brittany and Briana struggle to separate from each other on solo dates with their husbands.