The reality show follows the lives of six attached-at-the-hip, over-the-top mother-daughter pairs


How close is too close? There's no such thing, if you ask the stars of TLC's sMothered.

The reality show follows the lives of six attached-at-the-hip, over-the-top pairs of mothers and daughters with shockingly close bonds. And in PEOPLE's exclusive sneak peek at Sunday's episode, one of the duos, Mary and Brittani, head to a spa for a joint colon hydrotherapy session.

"I've had a colon cleanse before, but this is going to be Brittani's first time," Mary says. "After the colon cleanse, I feel amazing. But in the beginning, it's a little uncomfortable. I can tell by the look on Brittani's face that she's really nervous, so I think I'm going to go first."

The second she lies down, she grips her daughter's hand — much to the surprise of Erin, the owner of the spa.

"Colon hydrotherapy, or colonics, is water going into the colon, which flushes out the waste. It's just a very holistic approach to detoxification," she explains, admitting, "Mary and Brittani are the first mother-daughter that I have seen holding hands while they were getting colonics."

Credit: TLC

But Mary — who is clearly in discomfort, grunting and groaning — says she couldn't imagine doing it without her daughter.

"I have to have her by my side," she says. "She gives me that extra push — just the, 'Come on, let's do it!'"

Credit: TLC

Mary and Brittani are one of three new mother-daughter pairs in the season 2 cast. The cast also includes returning stars Sunhe and Angelica, Dawn and Cher, and Kathy and Cristina.

sMothered airs Sundays (10 p.m. ET) on TLC.