RHOSLC’s Mary Cosby SLAMMED for claiming Heather Gay looks ‘inbred’ despite star marrying her own step-grandfather

MARY Cosby has been slammed for claiming her costar Heather Gay looks "inbred" - despite marrying her own step-grandfather.

The RHOSLC star lashed out at Heather during a group trip to Zion in Sunday night's episode.

Things escalated when Lisa Barlow, 47, berated some of the girls for not backing her up when it comes to Mary's religion.

She yelled: "You guys all have a problem with Mary's church. You guys all have a problem with everything, but nobody f**king talks about it. I brought it all up.

"I took it for all of you and you all just sat there. You guys do not know how to show up!"

Heather, 39, and Jen Shah, 48, then comforted Lisa as she packed up to leave.

Mary, meanwhile, could be seen muttering about Heather - who recently renounced being Mormon - while standing by a window on her own.

She was caught on her mic saying: "Heather with her little judgmental self. She has the snobbiness of a true Mormon."

The 49-year-old added: "She don't even know she look inbred."

This is not the first time Mary has slammed Heather, having previously accused her Bravo costar of being "racist" and blocking her on Instagram.

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Mary's critics slammed her for the "inbred" comment and pointed out that she had married her own step-grandfather, Robert.

"Mary, married my step-grandfather, Cosby has the audacity to say @heathergay  looks like an “inbred Mormon?” Oh, honey have a million seats, please!" one wrote on Instagram.

"Mary is the most vile housewife on this series. Calling heather 'inbred'? What is wrong with you?" another raged.

"Mary says really mean & cruel things all the time. Tonight saying Heather looked inbred," a third posted.

Mary made headlines in the debut season of RHOSLC with her unusual marriage to her grandmother's former husband, Robert.

UNCONVENTIONAL MARRIAGE

Mary married Robert aged 22 to inherit her family's million-dollar fortune left behind by her grandma after her sudden heart attack death in 1997.

Her late grandmother, Rosemary Redmon Cosby, is the founder of Faith Temple Pentecostal Church in Salt Lake City, Utah.

"My grandmother in her will, she wanted me to take her place. I didn't want to. That's weird to me, but she wanted it," she said in one episode.

"Basically my grandmother passed everything on to me – literally – and she also wanted me marry her second husband, which was my step-grandfather.

"She really did and so, I obeyed her because I trusted every word."

They have been married for 20 years and Mary recently admitted that, while she is "in love" with Robert, they haven't had sex in the last few years and don't sleep in the same bed.

All episodes of Real Housewives of Salt Lake City are available on hayu.